Heating Repair in Germantown, MD:
15 Most Asked Questions

Most common in Montgomery County: dirty flame sensor, failed hot surface ignitor, clogged filter causing high limit trip, or thermostat set to ON not AUTO. In 20876 and 20874 we also see 14-inch flex return undersized for 3-ton systems — furnace overheats, limit opens, blower runs but no heat. Fix: new filter, clean flame sensor, check ignitor ohms. If heat exchanger is cracked, furnace will blow cold and CO detector may chirp — shut off and call for combustion test.

Almost every 2-story colonial built 1985-2015 in Montgomery County has one 14-inch return for a 3-ton furnace and 25-35% duct leakage in the attic. Cold air drops, hot air stratifies. Fix we do in Germantown: add second return in upstairs hallway, seal attic duct with mastic, add dampers, check external static pressure. Fixes cold rooms in Waters Landing, Churchill, Crystal Rock.

We run Manual J. Most 2,000 sq ft homes in Germantown 20876/20874 need 60k-80k BTU at 96% AFUE, not 100k. Oversized furnaces short-cycle, crack heat exchangers, and cause humidity issues. Montgomery County design temp is 14F, not 0F. We measure insulation, windows, infiltration, and duct leakage.

If repair >30% of replacement, heat exchanger rusted, or gas bills >$300 in Jan, replace with 96-98% AFUE modulating furnace with ECM blower and 5-inch filter cabinet. Payback 5-7 years on Washington Gas + rebates. We stock parts at Johnstone Supply Rockville/Gaithersburg for same-day repair if you want to repair.

Yes. Montgomery County requires mechanical + gas permit + inspection. We pull permit under MD HVAC 51701, MD Gas 110248, WSSC 74144. Includes gas piping BTU check, venting, combustion safety. Required for all homes including Germantown zip codes 20876 and 20874. No permit = no Washington Gas rebate.

We don't give phone prices — final cost depends on part, BTU, vent length. Common no-heat fixes in Montgomery County: flame sensor cleaning, ignitor, pressure switch, inducer motor, blower ECM module, gas valve, control board. Custom quote after on-site Manual J and static pressure test. Owner on every job, no subcontractors.

Leave house immediately, don't flip switches, don't use phone inside. Call Washington Gas emergency and 911 from outside. If you have propane or natural gas, we will pressure test piping, check gas valve, and do combustion analysis after Washington Gas clears. This is common in older Germantown homes with original black iron piping.

Open windows on way out, leave house, call us for same-day combustion safety test. We use analyzer to test CO in flue and supply air, check heat exchanger with camera, check draft, gas pressure, temperature rise. Cracked heat exchanger = red tag and replacement. Common in 20+ year old 80% furnaces in Montgomery County.

Yes. Cold-climate air-source heat pumps heat to -13F, perfect for dual-fuel: heat pump heats down to 30-35F, then gas furnace takes over in deep cold. Cuts Washington Gas bills 30-45%, qualifies for Washington Gas rebate + EmPOWER Maryland + federal 25C tax credit up to $2,000. We install in Germantown 20876/20874 with gas backup.

Once a year in fall. Our check: combustion analysis, CO test, gas pressure, temperature rise, heat exchanger camera, burner cleaning, inducer and blower amp draw, static pressure, filter cabinet. Keeps 96% AFUE at 96%, prevents no-heat calls in January when lows are 22F average.

Washington Gas SmartSavings: high-efficiency gas furnace 96%+ AFUE, condensing boiler 95%+, smart thermostat. Check wgsmartsavings.com/programs-rebates/md/home-heating and wgsmartsavings.com/programs-rebates/md. Plus PEPCO homeenergysavings.pepco.com and federal 25C. We are participating contractor, we provide AHRI certificate and invoice for rebate.

Top causes in Montgomery County: clogged 1-inch filter (switch to 4-inch or 5-inch cabinet), undersized return, oversized furnace, flame sensor dirty, thermostat in draft. We measure external static pressure — should be under 0.5 w.c. for most furnaces. High static = loud, cracked heat exchanger, cold second floor.

Yes, same-day no-heat repair in Germantown 20876, 20874 and Montgomery County. We stock ignitors, flame sensors, pressure switches, inducer motors, blower motors and ECM modules, gas valves, control boards at Johnstone Supply Rockville and RE Michel Gaithersburg. Owner on every job, 214 reviews 5.0 star.

If you have baseboard, cast iron radiators, or radiant floor — condensing boiler 95% AFUE wall-hung. If you have ductwork — 96-98% AFUE modulating gas furnace with ECM blower. Many older sections of Montgomery County have boiler + hydro-air. We do both and check gas piping BTU capacity per WSSC 74144.

Seal attic duct with mastic (saves 20-30%), add second return, upgrade to 96%+ AFUE modulating furnace or dual-fuel heat pump, install 5-inch filter (not 1-inch), smart thermostat with staging, and yearly combustion tune. We include Manual D duct check and static pressure test on every quote in Montgomery County.