Why Your AC is Taking Too Long to Cool Your Home

No one likes feeling uncomfortable in their own home. When temperatures rise outside, the last thing you want is for your air conditioner to fall behind. It is normal for your system to take time to cool your home, especially on hot days. However, if it often takes too long, it may mean there is a problem with your air conditioner.

How Long Should an AC Take to Cool a House?

When your AC works properly, it typically cools your home by 1 to 2 degrees per hour. If your AC takes too long to cool, it may indicate a problem with your system, especially if it’s a new issue.

Common Reasons Your AC is Taking Too Long to Cool Your Home

Dirty or Clogged Air Filters

One of the simplest yet most overlooked explanations for why your AC may be taking too long to cool is a dirty air filter. When dust and debris clog the filters, they restrict airflow and make it harder for your system to circulate cool air.

Low Refrigerant Levels 

The refrigerant in your system absorbs and releases heat. If your system has a leak or is low on refrigerant, your AC won’t cool properly. It may only blow warm air or slightly cool air.

Dirty Coils

When the evaporator coils are dirty, the system can’t transfer heat well. This makes your AC take longer to cool the house. Getting these cleaned should be part of your routine HVAC maintenance appointment.

Improper Thermostat Settings

Sometimes the issue is with your thermostat, not your AC unit. Contrary to popular belief, turning the temperature down too low on your thermostat won’t make your home cool faster. Programming it incorrectly can also slow the cooling process.

Blocked or Closed Vents

Your system cannot push out the air necessary to cool your home if the vents are obstructed by furniture or closed. Closing vents in rooms you don’t use often can help direct airflow. Make sure the vents you want open are clear and free of clutter. 

Wrong Size HVAC Unit

Your home needs the right-sized system to operate properly. A system that’s too small will run continuously and still fail to reach the desired temperature. On the other hand, a unit that is too big will turn on and off all day. It will not dehumidify the air or lower the temperature properly. 

Outdoor Factors That Could Be Causing Slow Cooling

Your air conditioner may not be entirely to blame for slow cooling. Environmental and home conditions can also impact how efficiently your system works.

• High outdoor temperatures
• Poor home Insulation
• Direct sunlight and heat gain

When Is it Time for a New System?

If your AC is not cooling fast enough, even after maintenance and repairs, it may be nearing the end of its life. Here are a few signs you might need to consider replacing your air conditioner:

• The system is more than 10 to 15 years old
• You’re calling for repairs more often than usual
• Some rooms stay warm while others cool unevenly
• Your energy bills are rising despite decreased comfort
• The unit can no longer keep up with your home’s cooling needs

Upgrading to a modern, energy-efficient system can provide faster cooling, better humidity control, and significant savings over time.

Thornton Can Help Keep Your Home Cool

Whether your AC is not cooling quickly enough or just doesn’t seem to keep up the way it used to, Thornton is here to help. Summer is in full swing in Chicago, and our team knows how important a working AC is right now. From routine HVAC maintenance to complete system replacements, our licensed technicians will diagnose the issue and get your comfort back on track.