Upstairs is hot all summer, downstairs is cold
One system, two floors: zoning splits it so each floor gets its own thermostat and the air goes where it’s called for.
We check first that the upstairs ducts are big enough to carry the air.
HVAC zoning and two-system homes
HVAC Zoning and Two-System Homes in Northern Virginia
Zoning puts motorized dampers in one system’s ducts and a thermostat on each floor, so upstairs and downstairs each hold their own temperature; a house with two systems already has two zones. Zoning is priced at your house after we see the ducts, and if something’s wrong with the system you have, the diagnostic is a flat $99. Call SwiftPro, rated 5.0 stars across 1,138 reviews, at (703) 997-9757, 24 hours a day, 7 days a week, anywhere in Northern Virginia.
Prices checked .
Tell us which floor or room is off, how many systems the house has, and about how old they are.
- Zoning, ductless or a second system, matched to your house
- Your price in writing before any work
- Diagnostic a flat $99
5.0 stars across 1,138 reviews
Two of our HVAC technicians in a Northern Virginia basement mechanical room.
Get your price in writing
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Licensed and insuredVirginia Class A contractor #2705192276
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Our own HVAC installersA dedicated heating and cooling team, separate from our plumbers
Price in writing firstYou see every option priced before anything is ordered
Start with the symptom
Zoning, ductless or a tune-up: which fits your house
What’s uncomfortable, and where, points to the fix. These six cover almost every house we see.
One room is always off
Usually not a zoning job. A ductless head heats and cools that room on its own.
The house has two systems and one floor still struggles
Two systems are two zones already. The fix is in the system or its ducts, not more dampers.
Start with a tune-up on that system, $99 per system.
A finished basement or addition has no ducts
Ductless, almost every time. Running new ducts through finished walls costs more and fights the system you have.
You’re replacing the system anyway
That’s the time to zone. A variable-speed system handles closed dampers far better than single-stage, and the ducts are open to us during the install.
You’re not sure why the room is cold
Closed or blocked vents, leaky ducts, a dirty filter and a thermostat in the wrong spot come first.
How zoning works
How HVAC zoning works inside one system
Dampers, thermostats and a panel, and the airflow question that decides whether it works.
A zoned system has three parts: a motorized damper in the duct to each zone, a thermostat in each zone, and a control panel at the furnace or air handler that reads the thermostats and opens or closes the dampers. When only upstairs calls for cooling, the panel closes downstairs and the system’s air goes up.
The catch is airflow. A system sized for the whole house, pushing all its air into one floor’s ducts, builds pressure in the ducts. That’s louder registers and harder work for the blower. Single-stage equipment usually needs a bypass damper or a zone sized to carry the extra air; a variable-speed blower slows itself down and handles it better.
So we measure the ducts and the system before we zone anything, and if the ducts can’t carry it, we say so and price the option that will work.
Each zone gets its own thermostat, like this one.
Two-system homes
Homes with two systems: two zones already
Common in Northern Virginia colonials and townhouses, and the first place to look.
Many Northern Virginia houses, colonials and townhouses especially, were built with two systems: one in the basement for the main floor and one in the attic for the bedrooms. That’s two zones already, each with its own thermostat.
When one floor still struggles, it’s usually that floor’s system or its ducts. The attic unit works the hardest, in the hottest part of the house, and it’s the one people forget. A dirty coil, a clogged filter, low refrigerant or upstairs ducts leaking into the attic all show up as a hot bedroom floor.
A tune-up is $99 per system, and it’s where we start. Anything it finds that needs a repair is quoted in writing before any work. What the tune-up covers. If it’s broken, AC repair and heating repair start with the $99 diagnostic.
Two of our technicians at a system in a utility closet.
What it costs
What decides what zoning costs at your house
Zoning has no list price, because four things at your house decide it.
- How many zones. Two is the common setup; each one more adds a damper and a thermostat.
- Where the ducts run. Dampers go in the trunk lines. Ducts we can reach from an unfinished basement or attic cost less than ducts behind finished ceilings.
- The equipment. Single-stage systems usually need a bypass; variable-speed systems often don’t.
- Whether zoning is the right answer at all. Sometimes a ductless head or a fix to the ducts you have does it for less, and we price that instead.
The price comes to you in writing before any work. Bigger jobs can be paid over time: our financing page has the plans, on approved credit.
One floor never feels right?
Tell us which rooms are off and how many systems the house has, and we’ll set a time to look.
At your house
How we work out the right fix for uneven floors
Before anyone talks about dampers, we look at five things.
- Which rooms are off, and when. Summer afternoons upstairs and winter mornings downstairs point to different fixes.
- How many systems, and their age. Two systems change the question from zoning to which system is struggling.
- The ductwork. Size, leaks and where it runs decide whether dampers will work.
- The equipment. Single-stage or variable-speed, and whether it can run with zones closed.
- The options, priced. Zoning, ductless, duct repair or a tune-up, in writing.
One of our HVAC technicians with a new outdoor unit in Northern Virginia.
Where we work
HVAC zoning and repair across Northern Virginia
We work across Fairfax, Arlington, Loudoun, Prince William, Fauquier and Stafford counties, from our three locations in Chantilly and Ashburn.
Keep reading
More on uneven rooms, ducts and new systems
Why one room is so coldThe common causes, from vents to ducts.Zoning or ductless for one roomWhich one fits a single cold room.Ductless mini splitsRoom by room, no ductwork.Furnace and AC replacementThe best time to add zoning.Heat pump vs furnaceWhich heat fits a Northern Virginia winter.AC repairWhen the upstairs system stops keeping up.FinancingHow the monthly plans work, on approved credit.OffersEvery deal we’re running right now.
Asked on the phone
HVAC zoning questions from Northern Virginia homeowners
What is HVAC zoning?
Motorized dampers inside one system’s ductwork, a thermostat for each zone and a control panel that ties them together. When upstairs calls for cooling and downstairs doesn’t, the dampers close the downstairs ducts and send the air up. One furnace or air handler, two or three thermostats, each floor at its own temperature.
How much does HVAC zoning cost in Northern Virginia?
It’s priced at your house, because the ducts decide it: how many zones, where the trunk lines run and whether the dampers can be reached from the basement or attic. Single-stage equipment often needs a bypass, and sometimes the better answer is a variable-speed system or a ductless head instead. If something’s wrong with the system you have, the diagnostic is a flat $99, and the zoning price comes to you in writing before any work.
My house has two systems. Why is one floor still uncomfortable?
Two systems are already two zones, so the usual causes are the system itself or the ducts: a dirty coil or filter, low refrigerant, a thermostat in the wrong spot, or upstairs ducts that are undersized or leaking into the attic. Start with a tune-up on the struggling one, often the upstairs unit, which in many houses sits in the attic, where it works hardest. A tune-up is $99 per system.
Is zoning or a ductless mini split better for one cold room?
For one room, usually ductless: a single head heats and cools that room on its own, with no ductwork changes. Zoning fits when a whole floor runs hot or cold and the ducts can carry the air. We look at both before we price either.
Can you add zoning to the system I already have?
Often, yes. The dampers go into the existing ductwork, and the thermostats and control panel are wired to the furnace or air handler you have. What we check first is whether the system can run with some zones closed: a single-stage blower pushing all its air into one floor’s ducts gets loud and hard on the equipment, so it needs a bypass or a variable-speed blower.
One floor too hot, another too cold?
Get the uneven floors looked at and priced
Send the form at the top with which rooms are off and how many systems the house has. The office calls or texts you back to set a time.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
SwiftPro Plumber & Water Heaters
4200 Lafayette Center Dr, Suite N, Chantilly, VA 20151
Virginia Class A contractor license #2705192276
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