Cooling Repair in Germantown, MD:
15 Most Asked AC Questions

Top causes in Montgomery County: dirty outdoor coil clogged with cottonwood, low refrigerant from leak at evaporator or Schrader valve, failed capacitor, clogged filter causing frozen coil, or thermostat set to HEAT. We check superheat, subcool, amp draw, static pressure, and leak test. No freon top-off without leak repair — EPA and Montgomery County code.

Same as heating — every 2-story colonial 1985-2015 in Germantown has one 14-inch return for 3-ton system and 25-35% duct leakage in 130F attic. Cold air falls, hot air stays upstairs. Fix: add second return upstairs, seal attic duct with mastic, add dampers, check 0.5 w.c. static, add return in master bedroom.

Manual J. Most 2,000 sq ft homes in Germantown 20876/20874 need 2.5-3 ton 16-20 SEER2, not 4 ton. Oversized AC short cycles, doesn't dehumidify, leaves house clammy at 72F and 65% humidity. Montgomery County design is 91F, not 100F. We measure windows, insulation, infiltration.

Low airflow from 1-inch filter (switch to 4-inch or 5-inch cabinet), blower ECM failing, indoor coil dirty, refrigerant low, or outdoor coil blocked. Turn OFF AC but leave fan ON to thaw 4-6 hours or you will burn compressor. Then call for static pressure and superheat test.

If repair >30% of replacement, R-22 system, coil leaking, SEER 10-13, or 【entity-PEPCO¦canonical_name=PEPCO】 bill $400 in July — replace with 16-20 SEER2 variable speed with ECM blower and 5-inch filter. Payback 5-7 years on 【entity-PEPCO¦canonical_name=PEPCO】 + rebates. We stock capacitors, contactors, fan motors, boards at Johnstone Supply Rockville.

We don't give phone prices — final cost depends on tonnage, SEER2, refrigerant type, and line set length. Common fixes: capacitor, contactor, fan motor, blower ECM module, drain float switch, control board, refrigerant leak repair. Custom quote after on-site Manual J, static pressure, and superheat/subcool test. Owner on every job.

Clogged condensate trap, cracked drain pan (rusted 15+ year air handler in attic), or frozen coil melting. In Montgomery County attics, water sensor shuts off AC to prevent ceiling collapse. Fix: clear trap, install float switch, replace pan, add secondary drain pan with sensor — code required for attic air handlers.

Oversized AC, clogged filter, failed low pressure switch from low refrigerant, or thermostat in sun/hallway draft. We measure external static — should be under 0.5 w.c. High static = noisy, frozen coil, hot second floor, short cycling, high 【entity-PEPCO¦canonical_name=PEPCO】 bill.

Yes. Mechanical + electrical permit + inspection. We pull permit under MD HVAC 51701 for all homes including 20876 and 20874. Includes disconnect, breaker size, line set, pad, and refrigerant. Required for 【entity-PEPCO¦canonical_name=PEPCO】 rebate and federal tax credit.

【entity-PEPCO¦canonical_name=PEPCO】 Home Energy Savings: high-efficiency central AC 16+ SEER2, heat pump 16+ SEER2/9+ HSPF2, smart thermostat at homeenergysavings.【entity-pepco¦canonical_name=PEPCO】.com plus federal 25C up to $2,000 and EmPOWER Maryland. Check 【entity-pepco¦canonical_name=PEPCO】.com and energystar.gov. We are participating contractor, provide AHRI certificate and invoice.

Cold-climate heat pump heats to -13F and cools at 20 SEER2. Dual-fuel setup: heat pump cools and heats down to 30-35F, gas furnace below that. Cuts 【entity-PEPCO¦canonical_name=PEPCO】 and Washington Gas bills 30-45%, qualifies for 【entity-PEPCO¦canonical_name=PEPCO】 + Washington Gas + federal credit. Best for Germantown 20876/20874 if you want one system year-round.

Once a year in spring. Our check: superheat, subcool, amp draw on compressor and fan, capacitor test, coil cleaning, drain clear, static pressure, temperature split 16-20F, refrigerant leak check. Keeps 16 SEER2 at 16 SEER2 and prevents July no-cool calls when highs are 89F average.

Yes, same-day no-cool in Germantown 20876, 20874 and Montgomery County. We stock capacitors, contactors, fan motors, blower ECM, boards, float switches, at Johnstone Rockville and RE Michel Gaithersburg. Owner on every job, 214 reviews 5.0 star.

10-13 SEER AC, leaky attic duct 25-35%, one 14-inch return for 3-ton, 1-inch filter choking airflow, outdoor coil blocked. Fix: seal duct with mastic, add second return, 5-inch filter, 16-20 SEER2 variable speed, smart thermostat with staging. Saves $80-150 per month in Germantown summer.

Seal attic duct, add return upstairs, upgrade to 16-20 SEER2 variable speed inverter, 5-inch filter, smart thermostat, yearly tune. We include Manual D duct check and static pressure on every quote in Montgomery County.