● Novum crews only — no contractors, no middlemenSame-day & emergency service available
How it worksReviewsCall 435-534-6764
NovumHome Services
435-534-6764
Address within 48–72 hours

HVAC

Why is my AC running but not cooling?

AC running but house won't cool down? Here are the most common causes and what to try before calling an HVAC technician.

Most common causes

  • 01Dirty air filter blocking airflow
  • 02Refrigerant leak (low charge)
  • 03Dirty evaporator or condenser coil
  • 04Frozen evaporator coil
  • 05Undersized system for the space
  • 06Refrigerant leak

What to do right now

1
Check and replace the air filter if dirty — this is the #1 cause
2
Check that all supply registers are open and unobstructed
3
Check that the outdoor condenser unit is clear of debris and running
4
Set the thermostat to 5 degrees below current room temperature and listen for the compressor to kick on

When to call a professional

Call an HVAC technician if: filter is clean but it still won't cool, you see ice forming on the refrigerant lines or indoor unit, the outdoor unit isn't running, or it's been over a year since last service.

Need a HVAC pro?

Novum's licensed crew shows up, diagnoses the problem, and fixes it — flat upfront quote, no surprises.

Call 435-534-6764Book online

What Novum does:

Novum HVAC technicians check refrigerant charge, clean coils, test all electrical components, and identify the root cause of cooling failure — repairing same day in most cases.

Novum's own crew
Flat upfront quote
Novum Guarantee
No middlemen

Browse HVAC services

See all HVAC services we offer

View HVAC →