When Your AC Doesn’t Keep You Cool
Few things are more frustrating than turning on your air conditioner on a hot Kansas day only to feel warm air coming through the vents. If this sounds familiar, you’re not alone. Many homeowners in Olathe, Overland Park, and throughout Johnson County face this problem every summer.
At Jack Harrison Heating & Air Conditioning, we’ve seen (and fixed) it all — and the good news is, in many cases, the solution is simpler than you might think.
1. Dirty or Clogged Air Filters
One of the most common reasons your AC blows warm air is a dirty filter. When filters are clogged with dust, pollen, and debris, airflow is restricted. This causes your system to overwork and reduces cooling efficiency.
Fix:
Replace filters every 1–3 months.
For homes with pets, allergies, or high dust, consider monthly changes.
Schedule a seasonal tune-up to have your system checked
💡 Pro Tip: Mark your calendar or set a reminder on your phone. Consistency can prevent bigger repairs later.
2. Thermostat Issues
Sometimes, the problem isn’t the system — it’s the thermostat. Incorrect settings or malfunctions can cause your system to run in “fan only” mode or cycle incorrectly.
Fix:
Double-check your thermostat is set to “cool” and the temperature is lower than your home’s current temp.
Replace old batteries and recalibrate if needed.
Consider upgrading to a smart thermostat for better control and energy savings.
3. Refrigerant Leaks
Your AC relies on refrigerant to absorb heat and cool your home. If there’s a leak, the system can’t cool properly and may blow warm air. This is a serious issue that requires a professional to come out for an AC Repair visit.
Signs of Low Refrigerant:
Ice on refrigerant lines.
Hissing or bubbling noises.
AC running continuously without cooling.
Fix:
Only a certified HVAC technician can safely repair leaks and recharge refrigerant.
4. Dirty Condenser Coils
The outdoor AC unit (condenser) releases heat outside your home. When coils are covered with dirt, grass clippings, or debris, they can’t do their job effectively.
Fix:
Gently rinse the outdoor unit with a garden hose (avoid pressure washers).
Keep shrubs, weeds, and grass trimmed back at least 2 feet around the unit.
5. Electrical or Mechanical Failures
If your compressor, capacitor, or fan motor fails, your system may run but won’t actually cool. These parts wear out over time, especially in Kansas homes where summers are long and hot.
Fix:
This is another issue where calling an experienced HVAC technician for an AC Repair is your best move.
6. Leaky Ductwork
In older Johnson County homes, ducts can develop cracks and leaks that let cool air escape into attics or crawl spaces. That means by the time air reaches your vents, it’s warm.
Fix:
Professional duct inspection and sealing not only restores cooling but also boosts efficiency.
When to Call the Pros
If your AC continues to blow warm air after checking filters and thermostat settings, it’s time to call in an expert. At Jack Harrison Heating & Air Conditioning, our family-owned team is known for:
Fast Response Times — We know a hot house can’t wait.
Honest, Affordable Pricing — Repairs first, replacements only when necessary.
Expert Technicians — Trained, certified, and trusted across Johnson County.
A warm-air problem doesn’t always mean your AC is done for. Sometimes it’s as simple as a filter change, while other times it’s a refrigerant leak or mechanical issue. The key is addressing it quickly before small problems become costly breakdowns.