Fairfax County, Virginia
Heating and AC repair in Herndon, VA
Call and describe the problem, whether the furnace will not light, the heat pump is iced over or the air conditioner is blowing warm air, and you will be connected with an independent HVAC contractor serving Herndon.
Your call is connected to an independent HVAC contractor, subject to availability in your area. HVAC Nation may receive compensation when your call is connected with a participating provider. Providers are independent businesses.
Herndon at a glance
Heating and cooling climate
NOAA's 1991–2020 climate normals for the WASHINGTON DC DULLES AP, VA station (about 4 miles away) show about 4,604 heating degree days and 1,233 cooling degree days in a typical year, with about 102 nights at or below freezing and 33 days reaching 90°F or more. Heating is the bigger load, but summers are warm enough that most homes rely on central air too, so both systems see real use every year.
How homes in Herndon are heated
According to the Census Bureau's American Community Survey, 60% of occupied homes in Herndon heat mainly with electricity and 37% with utility gas. With electric heat this common, heat pumps and electric furnaces are widespread, and a heat pump failure can take out both heating and cooling at once.
Housing age and HVAC systems
The median year built for housing in Herndon is 1983, and about 43% of its 8,076 housing units were built before 1980. Homes from this era commonly have forced-air furnaces with ductwork, and many have had the original furnace and air conditioner replaced at least once.
Services most relevant in Herndon
- Furnace Repair (4,604 heating degree days a year)
- Heat Pump Repair (60% of homes heat with electricity)
- AC Repair (about 33 days a year at 90°F or more)
- AC Replacement (median home built in 1983, many systems on their second or third AC)
- HVAC Repair (one call when you are not sure which part failed)
Owners, landlords and tenants
About 62% of occupied homes in Herndon are owner-occupied and 38% are rented. Homeowners, landlords and property managers can call to be connected; tenants should contact their landlord or property manager about heating or cooling problems first.
Nearby places
Herndon is in Fairfax County. Places within about 30 miles include Washington, DC (20 mi), Alexandria (19 mi), Gaithersburg, MD (16 mi), Rockville, MD (15 mi) and Leesburg (13 mi).
Other Virginia locations
Bristol (307 mi)
Questions
Is HVAC Nation an HVAC company in Herndon?
No. HVAC Nation is a referral service. Calls from Herndon are connected to an independent HVAC contractor, subject to availability in Fairfax County.
How do most homes in Herndon heat?
Census survey data shows about 37% of homes heat mainly with utility gas, 60% with electricity, 1% with propane and 0% with fuel oil.
How cold and hot does it get around Herndon?
NOAA normals for the WASHINGTON DC DULLES AP, VA station average about 102 nights a year at or below 32°F and 33 days at 90°F or above.
Is a permit needed to replace a furnace or air conditioner in Herndon?
Many cities and counties require mechanical or electrical permits for equipment replacement. Check with the local building department for Herndon or Fairfax County, and ask the contractor.
What should I do if I smell gas?
Leave the home right away without using switches or phones inside, then call the gas utility emergency line or 911 from outside.
Sources: U.S. Census Bureau Vintage 2024 population estimates; American Community Survey 2020–2024 5-year (tables B25040 house heating fuel, B25034, B25035, B25003); 2024 Gazetteer; NOAA NCEI U.S. Climate Normals 1991–2020 (heating and cooling degree days, base 65°F).