A Neighborhood Built in One Decade
Few places in Loudoun County are as uniform in age. The house in the photo is a "Williamsburg" colonial that Pulte Homes built in 1984, a typical Countryside model. Census estimates show how concentrated that building era is.
| Decade | Share of homes |
|---|---|
| 1980s | 75% |
| 2000s | 11% |
| 1990s | 7% |
| 2010 or later | 4% |
| Before 1980 | 2% |
Source: U.S. Census Bureau, American Community Survey 2024 5-year estimates, Countryside CDP. The housing mix is 48% detached homes, 30% townhomes and 21% apartments or condos.
Replacing Your HVAC? Deal With the Ducts at the Same Time
Most original 1980s furnaces and air conditioners in Countryside have been swapped out at least once. The ductwork usually stayed. Replacement day is the cheapest moment to fix it, because the air handler is already disconnected and the trunk lines are open.
Ask Your Installer
- Look inside the supply and return plenums before the new unit goes in
- Seal plenum and trunk joints with mastic or foil tape rated for ducts
- Replace crushed, torn or brittle flex duct runs
- Confirm the return size matches the new equipment
Watch Out For
- A high-efficiency unit connected to unsealed ducts
- Cloth "duct tape" on joints — it dries out and lets go
- A duct cleaning booked before the leaks are fixed
- Chemical fogging offered as a substitute for cleaning
ENERGY STAR estimates that a typical house loses about 20 to 30 percent of the air moving through its ducts to leaks, holes and poorly connected runs. Read how air duct sealing works before you compare quotes.
Best Time of Year for Duct Work in Countryside
| Season | Good for | Why |
|---|---|---|
| March–April | Cleaning, inspection | Heating season ends; ducts are clean before summer cooling |
| May–August | Coil and drain pan checks | Humid months keep the cooling coil wet — the EPA's main moisture concern |
| September–October | Cleaning, furnace-side work | Mild weather; ducts ready before heating season |
| After a renovation | Cleaning | Any season — drywall dust shouldn't circulate for months |
Typical Costs for Countryside Homes
- Single-family whole-home cleaning: about $500–$800 per system
- Townhome cleaning: about $190–$650
- Camera inspection: $0–$125
- Dryer vent cleaning: about $135–$360
Northern Virginia market ranges reviewed in 2026. Sealing and flex duct replacement are priced after inspection.
Next door, Cascades homes are about a decade newer — the Cascades page covers the townhome dryer vent issues that come with them.
Countryside Ductwork FAQs
What time of year should you clean your air ducts?
Early spring and early fall work best in Northern Virginia. The heating or cooling load is light, so shutting the system off for a few hours causes no discomfort, and the ducts are clean before months of heavy use. Schedule it right after any renovation, whatever the season.
Should I replace my ducts when I replace my HVAC system?
Not automatically. Have the ducts inspected and leak-tested while the old unit comes out. Sound metal ducts usually stay; leaky joints get sealed, and crushed or brittle flex duct gets replaced. A new high-efficiency unit connected to leaky 1980s ducts loses much of the benefit you paid for.
What are signs your air ducts need cleaning?
Dust blowing from supply registers, visible mold on the ducts or blower, and signs of pests are the clear signs. Rooms that stay too warm or too cold point more often to leaky or disconnected ducts than to dirt, so ask for an inspection before paying for cleaning alone.