Here is a short answer, but for a full explanation, read our guide. If it’s really hot or cold it is very possible it will run all the time. When properly engineered for your home, HVAC systems are sized to meet “design temperatures” in your area. In Raleigh the design temperature is 93 degrees in summer. If you want your house cooler than 75 degrees and the outside temperature is 93 or above, expect your system run continually trying to achieve your desired cooling level. In practice, many systems are oversized by up to half a ton (sometimes more) to achieve cooling that exceeds the ACCA (Air-Conditioning Contractors of America) or local code requirements but when the temperature is extremely hot or cold you can expect extended run times of your HVAC equipment. When temperatures are marginal your system should not run all the time. See our article, 5 Most Common Air-Conditioning Problems and Repairs if you suspect your might have an issue.
My HVAC system seems to run all the time, is this normal?
Here is a short answer, but for a full explanation, read our guide. If it’s really hot or cold it is very possible it will run all the time. When properly engineered for your home, HVAC systems are sized to meet “design temperatures” in your area. In Raleigh the design temperature is 93 degrees in summer. If you want your house cooler than 75 degrees and the outside temperature is 93 or above, expect your system run continually trying to achieve your desired cooling level. In practice, many systems are oversized by up to half a ton (sometimes more) to achieve cooling that exceeds the ACCA (Air-Conditioning Contractors of America) or local code requirements but when the temperature is extremely hot or cold you can expect extended run times of your HVAC equipment. When temperatures are marginal your system should not run all the time. See our article, 5 Most Common Air-Conditioning Problems and Repairs if you suspect your might have an issue.