Furnace Not Heating

“My house is 55° and the furnace keeps shutting off after a minute”

Short cycling is the furnace's safety system tripping — almost always a dirty flame sensor, cracked heat exchanger, or restricted airflow from a clogged filter. Efrain runs a full diagnostic before ordering any parts so you don't pay for the wrong fix.

“The furnace turns on but only cold air comes from the vents”

Cold air from a running furnace means the burners didn't light. Failed igniters, dirty flame sensors, or gas valve faults are the usual culprits. Most mid-efficiency Carrier, Trane, and Lennox furnaces in Rockville homes have igniters and flame sensors that Efrain carries on his truck — common repairs are completed the same day.

“I woke up to a cold house on a January morning”

Emergency calls across College Gardens, East Rockville, Fallsmead, Fallsgrove, and Flower Valley are Efrain's bread and butter in winter. He aims for same-day response, arrives with diagnostic tools and common parts, and doesn't leave until heat is restored or a clear next step is agreed on.

“My furnace makes a loud bang before it starts heating”

A delayed-ignition bang — fuel building up before it finally lights — means the burners are dirty or gas pressure is low. Left alone it stresses the heat exchanger, which separates combustion gases from your living air. That's a safety concern, not just a comfort issue. Worth diagnosing before it gets worse.

“My electric bill doubled but the house isn't any warmer”

A furnace that runs constantly without reaching setpoint is working against a failing component — often a cracked heat exchanger or a refrigerant issue on a heat pump. The system burns more fuel trying to hit a temperature it can't reach. A diagnostic call usually pays for itself in the first month of corrected operation.