When it is running properly, your home HVAC system should be nearly silent. You may not even realize it is running until you feel that refreshing blast of cool air on a hot summer day or feel the heat coming through your registers in the middle of winter.
If you hear your HVAC system constantly cycling on and off, you should immediately suspect a problem. There are a number of things that can cause an HVAC system to start cycling on and off, so it is best to address them one at a time. Here are some of the most common reasons HVAC units cycle on and off more than they should.
If your previously fine tuned HVAC unit starts cycling on and off, the first thing you should check is the sensor. If the sensor is dirty or damaged, the unit will start to cycle frequently, decreasing the efficiency of the system and causing your heating and cooling bills to spike.
An experienced HVAC technician can examine your sensors and tell if they are faulty. If a good cleaning does not restore the sensors to service, they will need to be replaced.
Improperly Sized Unit
An improperly sized unit can also cause short cycling in your HVAC system. If the unit in your home is too small for the demand, it will not be able to keep up when the weather gets very hot or very cold. If the unit is larger than it needs to be, it may not run at peak efficiency, creating another set of problems.
Always make sure your HVAC system is properly sized for your home. An experienced HVAC technician can examine your unit, make recommendations and help you find the system that best meets your needs.
If your HVAC filters are clogged or dirty, your unit may come on and off more frequently than it should. You should be changing the filters on a regular basis, based on the recommendations of the HVAC unit manufacturer.
You should also keep a supply of spare HVAC filters on hand, which will make changing them easier and more efficient. See your HVAC technician for the filters you need, then keep them near your unit.
A Faulty Thermostat
Last but not least, a faulty thermostat can also cause issues with HVAC system cycling. If you suspect your thermostat is bad, you can replace it with a new one to see if that resolves the problem. If not, you should contact your HVAC technician for expert diagnosis and service.
A short cycling HVAC system can present problems for your home and family, so having it diagnosed and fixed as soon as possible is very important. If your system is not running like it should, just call your local HVAC technician for the service you need.