We work on more boilers in McLean than in any other town we serve. In Reston and Ashburn we essentially never touch one; here it is a regular part of the week.
That is most of what makes heating here different. McLean has a genuinely old core, a lot of very large houses, and more systems per address than anywhere else we work. A no-heat call in McLean is more often “which of the three systems is it” than “is the furnace broken.”
What is actually in these houses
The community was founded in 1910 when Lewinsville and Langley merged, and the housing reflects every decade since. In practice we walk into four situations.
Original older homes near the village and along the river. Boilers with cast iron radiators or baseboard, sometimes converted from oil decades ago, sometimes still on the original near-boiler piping. These are repairable for a very long time if somebody maintains them, and expensive to neglect.
1950s through 1970s colonials and splits. Gas furnaces in a basement, one system, ductwork in a crawlspace or an unconditioned attic. Standard work.
Large newer and rebuilt houses, mostly 22102 and the tear-down streets in 22101. Two or three separate systems, zoned, often a mix: gas furnace and AC downstairs, heat pump or a second furnace for the upper floors, ductless for a finished basement or a pool house. Multiple thermostats, multiple filters, and multiple things that can fail independently.
Additions on older houses. The single most common comfort complaint in McLean, and rarely a broken furnace. Somebody added 800 square feet and tied it into ductwork sized for the original house.
Boiler symptoms, in plain language
One radiator cold, the rest fine. Air trapped in it, or a stuck valve. Bleeding is routine maintenance, not a repair emergency.
Banging or clanking when it fires. Air or water where it should not be. In steam systems, usually a pitch or a vent problem. Worth fixing because it is hard on the piping.
The boiler runs constantly and the house never gets there. Circulator, zone valve, or a control problem. On an older system, also check whether somebody closed off zones years ago.
Pressure dropping, or water on the floor. A leak somewhere in the loop or a failing section. This one gets looked at now rather than in January, because a boiler that loses water and keeps firing damages itself quickly.
What a boiler replacement costs in Northern Virginia is here, if you are getting to that point.
Furnace and heat pump symptoms
Lights and shuts off in seconds. Flame sensor, $95 to $180.
Clicking, no flame. Igniter, $240 to $410.
One zone warm, one cold, same system. Zone damper or its motor, not the furnace. In a three zone McLean house this is a frequent call and a modest repair.
Upstairs never keeps up on the coldest nights. If the upper system is a heat pump, it may simply be at its balance point, which manufacturers put around 30 to 35 degrees for a typical unit. If it is running aux heat in the 40s, something is wrong.
Water stain on a ceiling under an attic air handler. Condensate drain, $175 to $420, and cheap against the drywall it prevents.
What it costs here
Our repair prices are the same in McLean as they are in Woodbridge, which surprises people who assume the zip code is a surcharge. It is not. What does change your annual spend is the count: a house with three systems has three filters, three tune-ups and three things that can fail, so the yearly total runs higher than a one system house even when every visit is ordinary.
- Diagnostic: about $99.
- Flame sensor cleaned $95 to $180; igniter $240 to $410.
- Thermostat $300 to $640. Condensate drain or trap $175 to $420.
- 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.
Replacing one system in a multi-system house
When the first of three systems goes, two things are worth knowing.
Replace by system, not by house, unless the equipment all went in the same week. There is no efficiency in replacing a seven year old upstairs unit because the downstairs one failed at eighteen.
And size each one for what it actually serves now, not for what the old one was rated. Additions, finished basements and new windows all change the load, and half the systems we replace in bigger houses are a full size larger than the house needs, which is why they short cycle and why one room never gets comfortable.
A furnace alone runs $4,498 to $12,300 installed; a furnace and AC together $8,898 to $23,000 by size. The estimator prices it by system size in two minutes. For an addition or a room that has never worked, the ductless estimator is usually the more honest tool.
Understanding HVAC Repair Costs in McLean
Run every system, not just the one you notice. In a three thermostat house it is normal for a failure to go unnoticed until the first cold night, because the room it serves is a guest room nobody was in. Change every filter. If you have a boiler, bleed the radiators now rather than during the first freeze.
SwiftPro services furnaces, boilers and heat pumps across McLean. Call (703) 997-9757, book online, or see the McLean furnace repair page.
