Why Is My Furnace Blowing Cold Air?

Why Is My Furnace Blowing Cold Air?

Quick Answer: The most common cause of a furnace blowing cold air is a clogged air filter that overheats the system and trips the high-limit safety switch, which shuts off the burners but leaves the blower fan running. Other frequent causes include the thermostat fan...

Fall HVAC Maintenance Checklist for Oklahoma

Complete your fall HVAC maintenance checklist in September or early October, before the first cold snap arrives. Replace the air filter, test the thermostat in heat mode, clear the outdoor unit of summer debris, check and clear the condensate drain, inspect all vents...
HVAC Filter Guide: Types, Ratings & How Often to Change

HVAC Filter Guide: Types, Ratings & How Often to Change

Replace a standard 1-inch pleated filter every 30 to 90 days. Replace a 4 to 5-inch media filter every 6 to 12 months. For most Oklahoma homes, a MERV 8 to 11 filter is the right balance of air quality and system protection. Homes with pets, allergy sufferers, or high...