Furnace runs but blows cool air
The fan may be set to On, the burners may not be lighting, or a clogged filter may be making the furnace overheat and shut its burners off.
Green Leaf Heating & Cooling connects homeowners in Gladstone Park (60630) with local HVAC technicians. Brick bungalows, Georgians and mid-century homes on the streets around Gladstone Park. Call (312) 924-7223 and get a free estimate before any work starts.
Every service is available in Gladstone Park. These five come up most, given the housing. See all HVAC services.
Furnaces in brick homes from the 1920s to the 1960s: igniters, flame sensors, pressure switches and blower motors.
View details ↗02Replacement furnaces sized to the house, often two-stage for steadier heat on long winter nights.
View details ↗03Central air sharing the furnace’s ductwork: capacitors, refrigerant leaks and frozen coils.
View details ↗04Dual-fuel heat pumps when the AC is due for replacement.
View details ↗05Yearly service for the furnace and AC.
View details ↗The usual calls in Gladstone Park homes.
Ask a proThe fan may be set to On, the burners may not be lighting, or a clogged filter may be making the furnace overheat and shut its burners off.
Low refrigerant, a dirty outdoor coil or undersized ductwork can all leave the house warm in a heat wave. A technician measures before adding refrigerant.
Common in Georgians and raised ranches. Airflow balancing and return placement usually help.
Ask for a sizing check rather than a like-for-like swap. Many older furnaces were oversized, and a correctly sized unit runs quieter and evens out the heat.
If the AC is near the same age, ask for a combined option, so the new furnace and AC coil are matched.
Call us if your question isn’t answered here.
(312) 924-7223Gladstone Park is in 60630, part of our Northwest Side coverage. Every residential zip code in Chicago is covered; call with yours if you’re not sure.
Around 15 to 20 years is typical. Age alone isn’t a reason to replace, but an old furnace needing a major repair often is.
Some cool air for a minute while the heat exchanger warms up is normal. If it stays cool, the burners may not be lighting or the furnace may be overheating and shutting them off.
Call (312) 924-7223 and describe what’s happening. We connect you with a local technician and you get a free estimate before any work starts.
Green Leaf Heating & Cooling connects Chicago homeowners with local HVAC technicians. Repairs and installations are carried out by the independent technicians we connect you with.