Clifton is really two things sharing a zip code. The historic Town of Clifton is a few blocks of nineteenth century buildings with its own town government. The rest of 20124 is large-lot southwestern Fairfax County: houses on acreage, long driveways, wells and septic systems, and a fair number of properties where natural gas service does not reach the road.
Both halves need the same thing from a heating contractor, which is somebody who asks what fuel you burn before quoting anything.
What heats a Clifton house
Propane, where gas does not reach. A tank in the yard feeding a furnace that is otherwise identical to a natural gas one. Your fuel price moves with your supplier rather than a utility rate, and the natural gas rebate programs do not apply to you.
Heat pumps, on all-electric properties, usually with electric backup heat and sometimes with a propane furnace as the backup in a dual fuel setup.
Natural gas furnaces where the line does reach, which is more of the newer subdivision streets than the outlying properties.
Oil, still, on a handful of older properties. It is a declining share and it is genuinely serviceable, but when an oil system reaches the end the conversation is usually about converting rather than replacing like for like.
Boilers are rare here. Most of this housing is newer than the radiator era.
What goes wrong
It lights, runs a few seconds, shuts off, retries. Flame sensor, $95 to $180 to clean, and the most common no-heat call anywhere regardless of fuel.
Clicking, no flame. Hot surface igniter, $240 to $410.
Runs fifteen minutes and shuts down. Overheating on restricted airflow. Filter first, then the blower wheel at $300 to $440. On a larger house with long duct runs this arrives sooner than it would in a small one.
Water near a high efficiency furnace, or one that will not start. Condensate trap, $175 to $420. The furnace shuts itself off on purpose when it cannot drain.
Heat pump iced over and staying that way. Frost on a damp 35 degree day is normal. A block of ice at noon is not, and it is usually the defrost board at $450 to $1,150.
Aux heat running in mild weather. The electric strips are carrying the load, which is the most expensive way to heat a house in Virginia. Worth diagnosing before the bill arrives.
- Diagnostic visit: about $99.
- Flame sensor cleaned $95 to $180; igniter or sensor replaced $240 to $410.
- Condensate drain or trap $175 to $420. Thermostat $300 to $640.
- Blower wheel cleaned $300 to $440. Blower motor $670 to $2,400.
- Control board $550 to $1,180. Heat pump defrost board $450 to $1,150.
- Cracked heat exchanger: not a repair at any price. Here is why.
The thing that matters most out here: a power outage
Large lots on rural roads lose power more often and get it back later than a townhouse street in Fairfax City. That has two consequences for heat.
A gas or propane furnace still needs electricity for its board, inducer and blower, so it stops when the power does. An all-electric heat pump obviously does. If you have a generator, make sure the furnace circuit is actually on it, because plenty of installations cover the refrigerator and the well pump and skip the heat.
And if you are on a well, no power also means no water, which is the one that catches people out during a February ice storm. Worth thinking about together rather than separately.
Replacing, and the propane question
A furnace alone runs $4,498 to $12,300 installed; a furnace and air conditioner together $8,898 to $23,000 by system size. The estimator prices it by size in about two minutes with no phone number.
If you are on propane, the efficiency step up is usually worth more to you than it would be to a natural gas customer, because propane generally costs more per unit of heat. What you do not get is the Washington Gas rebate, which is limited to its natural gas customers, so the payback comes from the fuel saving alone. Ask for both efficiency tiers priced, and run the math against your own delivered propane cost rather than a generic number.
If you are all-electric and thinking about a heat pump, Dominion’s Home Energy Evaluation is a no-cost audit through a participating contractor and it is the door to its heat pump rebates. Ask about it before signing anything.
Common Heating System Failures and Repair Diagnostics
Run the heat for an hour. Check the propane level before the first cold week rather than after it. Confirm your generator actually covers the furnace circuit. Change the filter. Clear leaves from around and under any heat pump outdoor unit. And put a carbon monoxide alarm on every sleeping floor, because Virginia requires them in new construction with fuel burning appliances and has no retrofit rule for existing houses.
SwiftPro services heating systems across Clifton and southwestern Fairfax County. Call (703) 997-9757, book online, or start at the Fairfax County heating repair page.
