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Why Your AC Is Running Constantly in Palouse Summer Heat
If your ac running constantly in palouse summer heat, here's the short answer: during extreme heat above 95°F, it's often completely normal. Your system may run 12–16 hours per day — or nearly non-stop from midday through late evening — just to keep up. But constant running can also signal a real problem. Here's how to tell the difference fast:
Quick Answer: Is It Normal?
| Situation | What It Likely Means |
|---|---|
| Temps above 95°F, home stays cool | Normal — your AC is working as designed |
| Temps above 95°F, home still feels hot | Possible issue — dirty filter, low refrigerant, or undersized unit |
| Mild temps (below 85°F), AC won't shut off | Likely a problem — thermostat, refrigerant, or airflow issue |
| AC runs all day AND energy bills spike sharply | System strain — needs inspection |
| Ice visible on refrigerant lines | Stop the system — call a professional |
Palouse summers around Moscow, ID and Pullman, WA are no joke. Temperatures regularly push past 95°F, and the region's dry heat, wildfire smoke, cottonwood seeds, and older housing stock all put extra pressure on home cooling systems. Even a well-maintained AC can struggle when the mercury climbs and the air fills with smoke or seed fluff.
This guide from Unlimited Heating & Refrigeration Inc walks you through exactly what's normal, what's not, and what you can do about it — whether that's a quick DIY fix or a call to a local pro.
Is it Normal for My AC to Run Constantly in Palouse Summer Heat?
As we head into May 2026, we’ve already seen some early heat spikes across the Palouse. One of the most common questions we get at Unlimited Heating & Refrigeration Inc is: "Is it normal for my air conditioner to never turn off?"
In short: yes, when it’s 100 degrees in Moscow or Pullman, your AC is designed to run. Most air conditioning systems are built to handle a "delta T" (temperature difference) of about 15 to 20 degrees. This means if it is 100°F outside, your AC is working its hardest just to keep the inside at 80°F. If you have your thermostat set to 70°F on a triple-digit day, your unit will likely run 12 to 16 hours or even continuously from noon until the sun goes down.
When your ac running constantly in palouse summer heat happens during these peak hours, it’s often just the system doing its job to combat "heat buildup." Throughout the day, heat isn't just in the air; it’s absorbed into your walls, furniture, and flooring. Your AC has to remove all that stored energy. However, if the sun has gone down and the temperature has dropped to 75°F, but your system is still chugging away without cooling the house, you may be facing a mechanical issue. You can learn more about Why Won't Your AC Turn Off When It Reaches the Set Temperature to help diagnose these specific patterns.
Understanding AC Running Constantly in Palouse Summer Heat Patterns
Not all "constant running" is created equal. Depending on the age and type of your system, long runtimes might actually be a feature, not a bug.
- Single-Stage Systems: These are older or more basic units. They are either 100% "on" or 100% "off." If a single-stage system is running 24/7, it’s working at maximum capacity. This can lead to higher Avista energy bills and more wear and tear.
- Variable-Speed Systems: Modern high-efficiency units (like the Daikin systems we install) are designed to run for 12 to 18 hours a day. Unlike single-stage units, they can throttle down to a lower speed. They use less energy to maintain a steady temperature rather than cycling on and off. This leads to 3x more air circulation, which is vital during our local smoke seasons.
If you notice your system is running but the air coming out of the vents isn't cold, or if it's making strange noises, you might be dealing with common Air Conditioner Problems like a failing capacitor or a restricted motor.
Local Factors Affecting Cooling in Moscow and Pullman
The Palouse has a very specific "flavor" of summer that affects HVAC equipment differently than in other regions. Two of the biggest culprits for an ac running constantly in palouse summer heat are cottonwood seeds and pine needles.
In June and July, cottonwood trees release white, fluffy seeds that look like a summer snowstorm. These seeds are essentially "AC magnets." They get sucked into the outdoor condenser coils, creating a thick blanket that prevents the unit from releasing heat. This can reduce your cooling efficiency by 5 to 8°F almost overnight. If your unit is choked with fluff, it has to run much longer to achieve the same cooling effect.
Similarly, many homes in Troy, ID or Deary, ID are surrounded by beautiful pines. Pine needles can fall into the top of your AC unit and settle at the bottom, creating a damp compost layer that causes rust and restricts airflow.
If your outdoor unit looks like it’s wearing a sweater, it’s time for some AC Troubleshooting. A simple, gentle rinse with a garden hose (at a 45-degree angle) can often restore airflow and stop the constant running.
Why Wildfire Smoke and AC Running Constantly in Palouse Summer Heat Go Hand-in-Hand
In recent years, "Palouse Summer" has also meant "Smoke Season." When the AQI climbs above 200, we all close our windows tight. This keeps the smoke out, but it can make the indoor air feel incredibly stuffy and heavy.
When your AC runs constantly during a smoke event, it’s actually helping your indoor air quality—provided your filter is clean. The more the air circulates through your HVAC system, the more the smoke particles are trapped by your filter. However, smoke particles are microscopic and can clog a standard fiberglass filter in just a few weeks.
If your home feels "thick" or smells like a campfire even with the AC on, check these 5 Signs That You Need to Change Your AC Filter. We recommend upgrading to a high-efficiency MERV filter during the summer to better handle these regional air quality challenges.
DIY Checks and Reducing Strain on Your System
Before you call for a repair, there are several steps you can take to give your hardworking AC a break. Reducing the load on your system is the best way to stop an ac running constantly in palouse summer heat.
- The 78-Degree Rule: We know it sounds warm, but the Department of Energy recommends setting your thermostat to 78°F when you are home. Every degree you set it below 78°F can increase your energy consumption by about 8%.
- The "Auto" vs. "On" Fan Setting: Make sure your thermostat is set to "Auto." If it's set to "On," the fan will run 24/7 even when the cooling compressor is off, which can lead to higher humidity levels indoors.
- Ceiling Fan Direction: Ensure your ceiling fans are spinning counter-clockwise. This creates a "wind-chill" effect that makes you feel about 4 degrees cooler, allowing you to raise the thermostat without losing comfort.
- Manage Solar Gain: Close your south and west-facing blinds during the day. This can block up to 30% of the heat entering your home.
If you've tried these steps and your home still isn't reaching the set temperature, you might be experiencing a more serious failure. This is especially common in areas like Lewiston where the valley heat is even more intense. Check out our guide on When AC Stops Working in Lewiston for more localized advice.
Maintenance Tips for Palouse Homeowners
We’ve been serving the Moscow and Pullman area for over 20 years, and we’ve found that 80% of summer breakdowns could have been prevented with a spring tune-up.
To keep your system from running a marathon every day, we suggest:
- Clear the Perimeter: Keep at least 2 feet of space clear around your outdoor unit. Trim back any shrubs or weeds.
- Check Your Registers: Ensure at least 80% of your floor registers are open. Closing too many vents actually increases pressure and can cause the system to "short cycle" or freeze up.
- Annual Professional Tune-ups: We check refrigerant levels, tighten electrical connections, and lubricate moving parts. This is the single best way to ensure reliable performance.
While we focus on cooling in the summer, your ductwork and blower motor work year-round. Consistent Heating Maintenance Palouse WA also helps ensure your system is ready for the transition from cooling to heating.
When to Call for Professional AC Repair in the Palouse
Sometimes, an ac running constantly in palouse summer heat is a cry for help. If your system is running all day but the house is getting warmer, you likely have a mechanical failure.
The most common "emergency" we see is frozen evaporator coils. This happens when airflow is restricted (usually by a dirty filter or cottonwood seeds) or when refrigerant is low. The coils get so cold that the moisture in the air freezes into a block of ice. If you see ice on the copper lines leading to your outdoor unit, turn the system off immediately and call us. Running a frozen system can destroy the compressor.
Other signs you need professional help include:
- Strange Noises: Grinding (bearings), chattering (electrical), or hissing (refrigerant leak).
- Rising Humidity: If the air feels "sticky" despite the AC running, the system isn't effectively dehumidifying.
- Frequent Tripping: If your AC keeps shutting off because of the breaker, there is an electrical fault.
For a deeper dive into these symptoms, read our guide on how AC Might Need Repair and How to Identify Them. We provide expert AC Repair Palouse WA and comprehensive HVAC Repair Palouse WA across the entire region, from Garfield to Genesee.
Signs It’s Time for an Upgrade
If your system is more than 12 to 15 years old, it was likely designed for a different era of energy costs and climate patterns. Older systems in the Inland Northwest often use R-22 refrigerant, which is being phased out and is becoming very expensive to service.
If your repair costs are more than 50% of the cost of a new unit, or if your Avista bills are 30-40% higher than your neighbors', it may be time to consider an upgrade. Modern variable-speed systems are specifically designed to handle the "constant running" needs of a Palouse summer while using a fraction of the electricity.
We specialize in AC Replacement Palouse WA and AC Installation Palouse WA, offering high-efficiency options that can significantly improve your home comfort. As a Daikin dealer, we can offer a 12-year warranty and our Comfort Promise, giving you peace of mind for over a decade of summers.
Frequently Asked Questions about Palouse Cooling
Should I leave my AC on all day or turn it off when I leave?
In the Palouse, it is generally better to leave your AC on, but raise the temperature by 5 to 7 degrees when you’re away. If you turn the system completely off on a 95-degree day, the "structural heat" in your walls and furniture will skyrocket. When you get home and turn it back on, the system has to work twice as hard for several hours to "catch up." Leaving it on at a higher setting is more efficient and puts less strain on the equipment.
Why does my house feel stuffy even when the AC is running?
This is often due to "short cycling" or an older single-stage system. AC units remove humidity by passing air over a cold coil. If the system is too large for your home, it cools the air so fast that it doesn't run long enough to remove the moisture. This leaves you with cold, clammy air. Modern variable-speed systems solve this by running longer at a lower speed, maintaining a perfect 40-50% humidity level.
What should I do if my AC trips the circuit breaker?
If your breaker trips once, you can try resetting it. However, if it happens again, do not reset it a second time. A tripping breaker is a safety mechanism. It usually means the compressor is drawing too much power, there’s a short circuit, or the condenser fan is failing. You can learn more about Why AC Trips the Circuit Breaker to understand the risks involved.
Conclusion
Dealing with an ac running constantly in palouse summer heat can be stressful, but in many cases, your system is just doing its best to keep you comfortable in a challenging climate. By performing simple DIY checks—like hosing off cottonwood seeds and changing your filters—you can help your system run more efficiently.
At Unlimited Heating & Refrigeration Inc, we are proud to be a family-owned business with over 20 years of experience serving our neighbors in Moscow, ID, Pullman, WA, and the surrounding areas. Whether you need a quick repair in Potlatch or a full AC Installation Palouse WA in Colfax, we are here to help.
Don't let the summer heat get the best of your home. If your AC is struggling to keep up, or if you're worried about those rising energy bills, give us a call or visit our air conditioning services page to schedule a professional assessment. We’ll make sure your system is ready to handle whatever the Palouse summer throws at it!
Why Your AC Is Running Constantly in Palouse Summer Heat
If your ac running constantly in palouse summer heat, here's the short answer: during extreme heat above 95°F, it's often completely normal. Your system may run 12–16 hours per day — or nearly non-stop from midday through late evening — just to keep up. But constant running can also signal a real problem. Here's how to tell the difference fast:
Quick Answer: Is It Normal?
| Situation | What It Likely Means |
|---|---|
| Temps above 95°F, home stays cool | Normal — your AC is working as designed |
| Temps above 95°F, home still feels hot | Possible issue — dirty filter, low refrigerant, or undersized unit |
| Mild temps (below 85°F), AC won't shut off | Likely a problem — thermostat, refrigerant, or airflow issue |
| AC runs all day AND energy bills spike sharply | System strain — needs inspection |
| Ice visible on refrigerant lines | Stop the system — call a professional |
Palouse summers around Moscow, ID and Pullman, WA are no joke. Temperatures regularly push past 95°F, and the region's dry heat, wildfire smoke, cottonwood seeds, and older housing stock all put extra pressure on home cooling systems. Even a well-maintained AC can struggle when the mercury climbs and the air fills with smoke or seed fluff.
This guide from Unlimited Heating & Refrigeration Inc walks you through exactly what's normal, what's not, and what you can do about it — whether that's a quick DIY fix or a call to a local pro.
Is it Normal for My AC to Run Constantly in Palouse Summer Heat?
As we head into May 2026, we’ve already seen some early heat spikes across the Palouse. One of the most common questions we get at Unlimited Heating & Refrigeration Inc is: "Is it normal for my air conditioner to never turn off?"
In short: yes, when it’s 100 degrees in Moscow or Pullman, your AC is designed to run. Most air conditioning systems are built to handle a "delta T" (temperature difference) of about 15 to 20 degrees. This means if it is 100°F outside, your AC is working its hardest just to keep the inside at 80°F. If you have your thermostat set to 70°F on a triple-digit day, your unit will likely run 12 to 16 hours or even continuously from noon until the sun goes down.
When your ac running constantly in palouse summer heat happens during these peak hours, it’s often just the system doing its job to combat "heat buildup." Throughout the day, heat isn't just in the air; it’s absorbed into your walls, furniture, and flooring. Your AC has to remove all that stored energy. However, if the sun has gone down and the temperature has dropped to 75°F, but your system is still chugging away without cooling the house, you may be facing a mechanical issue. You can learn more about Why Won't Your AC Turn Off When It Reaches the Set Temperature to help diagnose these specific patterns.
Understanding AC Running Constantly in Palouse Summer Heat Patterns
Not all "constant running" is created equal. Depending on the age and type of your system, long runtimes might actually be a feature, not a bug.
- Single-Stage Systems: These are older or more basic units. They are either 100% "on" or 100% "off." If a single-stage system is running 24/7, it’s working at maximum capacity. This can lead to higher Avista energy bills and more wear and tear.
- Variable-Speed Systems: Modern high-efficiency units (like the Daikin systems we install) are designed to run for 12 to 18 hours a day. Unlike single-stage units, they can throttle down to a lower speed. They use less energy to maintain a steady temperature rather than cycling on and off. This leads to 3x more air circulation, which is vital during our local smoke seasons.
If you notice your system is running but the air coming out of the vents isn't cold, or if it's making strange noises, you might be dealing with common Air Conditioner Problems like a failing capacitor or a restricted motor.
Local Factors Affecting Cooling in Moscow and Pullman
The Palouse has a very specific "flavor" of summer that affects HVAC equipment differently than in other regions. Two of the biggest culprits for an ac running constantly in palouse summer heat are cottonwood seeds and pine needles.
In June and July, cottonwood trees release white, fluffy seeds that look like a summer snowstorm. These seeds are essentially "AC magnets." They get sucked into the outdoor condenser coils, creating a thick blanket that prevents the unit from releasing heat. This can reduce your cooling efficiency by 5 to 8°F almost overnight. If your unit is choked with fluff, it has to run much longer to achieve the same cooling effect.
Similarly, many homes in Troy, ID or Deary, ID are surrounded by beautiful pines. Pine needles can fall into the top of your AC unit and settle at the bottom, creating a damp compost layer that causes rust and restricts airflow.
If your outdoor unit looks like it’s wearing a sweater, it’s time for some AC Troubleshooting. A simple, gentle rinse with a garden hose (at a 45-degree angle) can often restore airflow and stop the constant running.
Why Wildfire Smoke and AC Running Constantly in Palouse Summer Heat Go Hand-in-Hand
In recent years, "Palouse Summer" has also meant "Smoke Season." When the AQI climbs above 200, we all close our windows tight. This keeps the smoke out, but it can make the indoor air feel incredibly stuffy and heavy.
When your AC runs constantly during a smoke event, it’s actually helping your indoor air quality—provided your filter is clean. The more the air circulates through your HVAC system, the more the smoke particles are trapped by your filter. However, smoke particles are microscopic and can clog a standard fiberglass filter in just a few weeks.
If your home feels "thick" or smells like a campfire even with the AC on, check these 5 Signs That You Need to Change Your AC Filter. We recommend upgrading to a high-efficiency MERV filter during the summer to better handle these regional air quality challenges.
DIY Checks and Reducing Strain on Your System
Before you call for a repair, there are several steps you can take to give your hardworking AC a break. Reducing the load on your system is the best way to stop an ac running constantly in palouse summer heat.
- The 78-Degree Rule: We know it sounds warm, but the Department of Energy recommends setting your thermostat to 78°F when you are home. Every degree you set it below 78°F can increase your energy consumption by about 8%.
- The "Auto" vs. "On" Fan Setting: Make sure your thermostat is set to "Auto." If it's set to "On," the fan will run 24/7 even when the cooling compressor is off, which can lead to higher humidity levels indoors.
- Ceiling Fan Direction: Ensure your ceiling fans are spinning counter-clockwise. This creates a "wind-chill" effect that makes you feel about 4 degrees cooler, allowing you to raise the thermostat without losing comfort.
- Manage Solar Gain: Close your south and west-facing blinds during the day. This can block up to 30% of the heat entering your home.
If you've tried these steps and your home still isn't reaching the set temperature, you might be experiencing a more serious failure. This is especially common in areas like Lewiston where the valley heat is even more intense. Check out our guide on When AC Stops Working in Lewiston for more localized advice.
Maintenance Tips for Palouse Homeowners
We’ve been serving the Moscow and Pullman area for over 20 years, and we’ve found that 80% of summer breakdowns could have been prevented with a spring tune-up.
To keep your system from running a marathon every day, we suggest:
- Clear the Perimeter: Keep at least 2 feet of space clear around your outdoor unit. Trim back any shrubs or weeds.
- Check Your Registers: Ensure at least 80% of your floor registers are open. Closing too many vents actually increases pressure and can cause the system to "short cycle" or freeze up.
- Annual Professional Tune-ups: We check refrigerant levels, tighten electrical connections, and lubricate moving parts. This is the single best way to ensure reliable performance.
While we focus on cooling in the summer, your ductwork and blower motor work year-round. Consistent Heating Maintenance Palouse WA also helps ensure your system is ready for the transition from cooling to heating.
When to Call for Professional AC Repair in the Palouse
Sometimes, an ac running constantly in palouse summer heat is a cry for help. If your system is running all day but the house is getting warmer, you likely have a mechanical failure.
The most common "emergency" we see is frozen evaporator coils. This happens when airflow is restricted (usually by a dirty filter or cottonwood seeds) or when refrigerant is low. The coils get so cold that the moisture in the air freezes into a block of ice. If you see ice on the copper lines leading to your outdoor unit, turn the system off immediately and call us. Running a frozen system can destroy the compressor.
Other signs you need professional help include:
- Strange Noises: Grinding (bearings), chattering (electrical), or hissing (refrigerant leak).
- Rising Humidity: If the air feels "sticky" despite the AC running, the system isn't effectively dehumidifying.
- Frequent Tripping: If your AC keeps shutting off because of the breaker, there is an electrical fault.
For a deeper dive into these symptoms, read our guide on how AC Might Need Repair and How to Identify Them. We provide expert AC Repair Palouse WA and comprehensive HVAC Repair Palouse WA across the entire region, from Garfield to Genesee.
Signs It’s Time for an Upgrade
If your system is more than 12 to 15 years old, it was likely designed for a different era of energy costs and climate patterns. Older systems in the Inland Northwest often use R-22 refrigerant, which is being phased out and is becoming very expensive to service.
If your repair costs are more than 50% of the cost of a new unit, or if your Avista bills are 30-40% higher than your neighbors', it may be time to consider an upgrade. Modern variable-speed systems are specifically designed to handle the "constant running" needs of a Palouse summer while using a fraction of the electricity.
We specialize in AC Replacement Palouse WA and AC Installation Palouse WA, offering high-efficiency options that can significantly improve your home comfort. As a Daikin dealer, we can offer a 12-year warranty and our Comfort Promise, giving you peace of mind for over a decade of summers.
Frequently Asked Questions about Palouse Cooling
Should I leave my AC on all day or turn it off when I leave?
In the Palouse, it is generally better to leave your AC on, but raise the temperature by 5 to 7 degrees when you’re away. If you turn the system completely off on a 95-degree day, the "structural heat" in your walls and furniture will skyrocket. When you get home and turn it back on, the system has to work twice as hard for several hours to "catch up." Leaving it on at a higher setting is more efficient and puts less strain on the equipment.
Why does my house feel stuffy even when the AC is running?
This is often due to "short cycling" or an older single-stage system. AC units remove humidity by passing air over a cold coil. If the system is too large for your home, it cools the air so fast that it doesn't run long enough to remove the moisture. This leaves you with cold, clammy air. Modern variable-speed systems solve this by running longer at a lower speed, maintaining a perfect 40-50% humidity level.
What should I do if my AC trips the circuit breaker?
If your breaker trips once, you can try resetting it. However, if it happens again, do not reset it a second time. A tripping breaker is a safety mechanism. It usually means the compressor is drawing too much power, there’s a short circuit, or the condenser fan is failing. You can learn more about Why AC Trips the Circuit Breaker to understand the risks involved.
Conclusion
Dealing with an ac running constantly in palouse summer heat can be stressful, but in many cases, your system is just doing its best to keep you comfortable in a challenging climate. By performing simple DIY checks—like hosing off cottonwood seeds and changing your filters—you can help your system run more efficiently.
At Unlimited Heating & Refrigeration Inc, we are proud to be a family-owned business with over 20 years of experience serving our neighbors in Moscow, ID, Pullman, WA, and the surrounding areas. Whether you need a quick repair in Potlatch or a full AC Installation Palouse WA in Colfax, we are here to help.
Don't let the summer heat get the best of your home. If your AC is struggling to keep up, or if you're worried about those rising energy bills, give us a call or visit our air conditioning services page to schedule a professional assessment. We’ll make sure your system is ready to handle whatever the Palouse summer throws at it!
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Unlimited Heating & Refrigeration, Inc have always gone out of their way to assist us in meeting our needs. Our heating/cooling issues have always been listened to and thoroughly explored with us in a timely manner and most importantly resolved quickly. We appreciate this business and will continue to support them when needed.
Outstanding customer service!! I was blown away by the help, clear communication, and expertise of this company. My parents were experiencing plumbing problems and Amanda not only took my call after hours but had someone to their house early the next morning and the problem solved in an hour. I would highly recommend this company for any plumbing needs and won’t hesitate to use them again! Very happy with the experience.
Fast scheduling for my new Bosch dishwasher installation. The technician was on time, friendly and very experienced. The whole process was under 2 hours. Great work.
Furnace and AC installation: Exceptional responsiveness, quality professional installation (incl some deduct work revision in attic & coordination with electrician). All personnel were congenial and clearly presented info and answered all questions clearly. While a big job, we hardly knew they were here: quiet, efficient and cleaned up very well daily.Great people, Great service! Absolutely would call them for other service! Highly Recommend!!
