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2026-03-11 • 1 min read

AC not blowing cold air: quick checks you can do today

Before you call HVAC, check filters, thermostat settings, iced coils, and the outdoor unit. These fixes solve a lot of ‘no cold air’ calls.

When AC blows warm, it’s often an easy fix: filter, thermostat, or frozen coils.

1) Thermostat basics

  • Set to Cool
  • Lower setpoint by 3–5°F
  • Fan on Auto (not On)

2) Replace the air filter

A clogged filter can choke airflow and freeze coils.

See top-rated options on Amazon for “hvac air filter merv 8”

3) Check for ice on the indoor coil

If you see ice:

  • turn system off
  • set fan to On to thaw
  • replace filter

4) Check the outdoor unit

  • Clear leaves/debris
  • Make sure it’s running (you should hear/feel it)

5) When to call HVAC

Call if:

  • breakers trip
  • coils re-freeze quickly
  • outdoor unit won’t run

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