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My House is Not Reaching the Set Temperature

If your thermostat isn’t reaching the set temperature, it's not rebelling; there's likely an underlying problem with your system. Before calling in a specialist, you can try to diagnose the problem yourself with a few helpful clues as to why your HVAC system might be misbehaving.

Why Your Home Isn't at the Temperature You Set

When your heating or cooling system isn't doing its job, it can be frustrating and unpleasant. Get back to comfort with these troubleshooting tips.

Potential Issues

  • not reaching temperature set on thermostat
  • no heat coming from vents
  • heating unit won't turn on

Inside your home's heating and cooling system, there is a blower motor that spins the fans to circulate air and keep the temperature even throughout your home. If debris gets into the fan or the bearings wear down, the motor can break down. When the blower motor fails, that circulation stops and your cooling or heating system will not work properly. But, before either system shuts down, the first thing you'll likely notice is that your home won't reach the temperature set on your thermostat. To get your systems back in line, you'll need to repair or replace your blower motor.

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  • puddle around the indoor air conditioning unit
  • air is humid
  • moisture on cold surfaces
  • not reaching temperature set on thermostat
  • blower sounds strange
  • AC keeps turning on and off
  • air smells strange
  • air is too hot
  • furniture is warped

Your AC unit works to cool the air in your home by way of its evaporator coils. The coils allow the cooling chemicals (needed to cool your air) to evaporate from liquid to gas and absorb the heat in your air, which is how your air gets cooled. Because this part is exposed to such cold temperatures, it is vulnerable to freezing. The coil will freeze if the system is low on refrigerant or has an airflow issue, as a result of a dirty coil, filter, fan wheel, or heat exchanger. If this occurs, and is not caught in time, the issue can escalate further and the larger refrigerant line may freeze. If this is the case, you will see ice on the suction line leading from the inside unit to the outdoor unit.

  • ice is forming on the air conditioning unit
  • not reaching temperature set on thermostat

A heat pump works year round to keep a steady temperature in your home. Sometimes they fail due to faulty controls, poor communication between the control board and the system, or an issue with wiring. Like any other part of your system, it can also wear with age. If your heat pump isn’t working properly during the wintertime, especially if it’s not defrosting, this is likely due to a worn, damaged, failed defrost termination switch or defrost control board. It’s time for a replacement.

  • high electricity bills
  • ice is forming on the air conditioning unit
  • not reaching temperature set on thermostat

TXV is short for thermostatic expansion valve. It is the part in your air conditioning system that is responsible for maintaining a steady flow of refrigerant to the evaporator using a sensing bulb — critical to keep you cool. In most cases, the TXV fails because the sensing bulb has lost its charge.

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