Why Does the AC Take So Long to Cool Down the House?

When it’s hot outside, you rely on your air conditioner to keep things cool inside. But is your AC taking forever to cool down the house? This is typical on sweltering days, which push your air conditioner harder than usual. However, if it’s not particularly hot outside and your AC is still having a hard time, your cooling equipment could have a problem. Follow these tips to help you troubleshoot the issue. 

Dirty Air Filter 

A clogged filter is the most common reason an air conditioner takes too long to cool down the house. The purpose of a filter is to trap airborne debris that could damage delicate HVAC equipment. More advanced filters even trap very small airborne allergens to improve indoor air quality

As time passes, the filter becomes blocked up with dust, pet hair, and textile fibers, restricting airflow. Besides making your air conditioner take longer to cool down the house, this situation can also lead to higher energy bills, increased wear and tear, and overheating. 

Solution: Check your air filter once a month and exchange it if it appears dirty. Don’t wait longer than three months to exchange the filter or follow the manufacturer’s recommendations. If you’re not sure where your air filter is located, ask your HVAC technician at your next service visit. 

Improper Thermostat Settings 

Your thermostat must be compatible with your air conditioner to run properly. Then, you must set it correctly to maintain a nice temperature. Using a programmable or Wi-Fi thermostat provides the best results. 

Solution: If you want to upgrade your thermostat, require help learning about programmable features, or don’t feel comfortable programming a thermostat yourself, contact an HVAC technician at Epperson Service Experts for assistance. 

Dirty Evaporator Coil 

Split-system air conditioners have an indoor unit and an outdoor unit. The indoor unit contains the evaporator coil, which absorbs heat from the air using refrigerant. It’s hard for the refrigerant to absorb heat effectively if the evaporator coil is filthy, making it take longer to cool your house. 

Solution: Contact our HVAC specialists to clean and tune up your air conditioner. Part of this visit includes cleaning out dust and grime from the evaporator coil to improve cooling performance. 

Dirty or Obstructed Outdoor Unit 

A cooling cycle involves sending hot refrigerant to the outdoor unit, where it ventilates heat to the exterior. That said, if the outdoor unit is dirty or surrounded by encroaching vegetation, the cooling process may be less effective. 

Solution: Gently clean the outdoor unit to remove dust, cobwebs, pine needles and grass clippings. Then, trim back bushes to at least 12 inches from the unit to improve ventilation. 

Refrigerant Leak 

Refrigerant is the key to air conditioning. Usually, this substance flows in a closed loop between the indoor and outdoor units. If a leak develops and your cooling loses refrigerant, it becomes less capable of absorbing and dissipating heat from your home. 

Solution: Only a licensed technician can repair refrigerant leaks and recharge the system. If you suspect this problem, call our HVAC pros for help right away. 

Leaky Ductwork 

Air ducts are the arteries and veins of your HVAC system. A leak from either the return or supply side can make your air conditioner work harder and longer to cool your home. 

Solution: If you notice irregular temperatures and excessive dust throughout the house, contact Epperson Service Experts to inspect your ductwork. Duct sealing or replacement can fix the problem. 

Dirty or Blocked Air Vents 

Cooled air can only flow through your home if the supply and return vents are open and unobstructed. Closing too many vents can even throw off the system’s balance, resulting in additional breakdowns and repair costs. 

Solution: Check the vents all through the house, making sure they’re open and unblocked by furniture, rugs or curtains. 

Aging or Undersized Air Conditioner 

Did you install your air conditioner more than 10 to 15 years ago? As it gets older, the AC becomes less efficient and may fail to maintain steady cooling. Furthermore, have you recently built a home addition or made other modifications? This could result in an undersized air conditioner that can’t keep up with demand. 

Solution: The only fix for an aging or undersized air conditioner is to replace it. Trust our licensed HVAC technicians to size and install your new unit for comfort and efficiency. 

Schedule AC Repair with Epperson Service Experts 

If your troubleshooting efforts prove ineffective, don’t hesitate to call in the HVAC pros at Epperson Service Experts. We supply fast, efficient services to get your AC back up and running as quickly as possible. Rest assured that our technicians follow the highest standards of care to ensure your long-term satisfaction. Contact us to schedule air conditioning repair or any other HVAC services today. 

Savings For You

See All Offers Here >

$50 OFF HVAC Tune-up Special

There’s no reason to skip your seasonal maintenance that saves energy and helps ensure your air conditioner and heater will work reliably all season long.

  • Regularly $129, now only $79
  • Save up to 30% on energy bills
  • Written Expert Service Guarantee

$50 OFF Any Repair

  • Save $50 on a Paid Service
  • Written 100% Satisfaction Guarantee
  • Plus, ask how to save an additional 15% and waive your trip charge!

© 2023 Service Experts, Service Experts Heating & Air Conditioning, and the Service Experts logo and design are registered trademarks of Service Experts LLC and used under license by SE Canada Inc. All Rights Reserved. *Not applicable to the Advantage Program. See your signed Advantage Program Agreement for full details and exclusions. 100% Satisfaction Guarantee is subject to certain restrictions and limitations as set forth in the applicable Terms and Conditions.