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Is a ductless head the right answer, or is it the duct work?
Three questions. The answer is sometimes a ductless system, often a duct repair, and occasionally a setting. All three are cheaper than the wrong one.
The check
This narrows the options. It does not size equipment — that needs a load calculation from the building itself — and it cannot see your crawlspace, which is where the answer usually is.
What that points to
There is a vent, the rest of the house is fine, and very little air is arriving. That is a duct problem far more often than a capacity problem — a disconnected boot, a crushed flex run, or a return path the door closes off.
A ductless head would work, but it would be an expensive way of covering up something that may cost a fraction to fix. Measure first.
No duct reaches the space and the rest of the house is served properly. Extending a duct run into one room usually means opening ceilings or crawlspace work for a result that is still at the end of a long run.
One head, sized for that room, on its own control, is normally cheaper and better behaved — and it gives you cooling in that room as well.
An addition or a finished basement is a new load on a system that was sized before it existed. Pushing it onto the existing ducts is how the whole house ends up slightly wrong instead of one room being obviously wrong.
A head of its own keeps the new space independent, and it means the original system is not asked to do something it was never sized for.
Electric baseboards and wall heaters convert electricity to heat one for one. A heat pump moves several times that much heat for the same electricity, which is why the change is worth doing rather than simply pleasant.
With no ducts in the house, a multi-head ductless system is normally the practical route — one outdoor unit and a head in each area that needs one. A ducted heat pump is possible but means installing duct work from scratch.
If a ducted system struggles everywhere, adding a ductless head fixes one room and leaves the rest exactly as it was. The usual causes are duct leakage, undersized returns, a failing blower or equipment at the end of its life.
Get it measured. The answer may be duct repairs, it may be a replacement sized properly this time, and it may be both — but it is not one head in the worst room.
For a workshop or garage that will be used as a room — an office, a studio, a gym — a ductless head heats and cools it quietly and cheaply to run.
For a space that only needs to be above freezing, or that will have doors opening all day, a unit heater is usually the better buy. Tell us what happens in there and we will say which.
Whether a duct reaches the space changes the answer completely, and it is quick to establish. Very often there is a run that was capped, crushed or disconnected years ago and nobody knew.
We will look, measure what is arriving, and tell you which of the answers on this page you are actually in.
- In a single room, measure what the register delivers before anything else. It is the one number that settles most of these arguments.
- An addition changes the whole-house load, so it is worth knowing whether the original system still has headroom before deciding.
- Whole-house work is where a proper load calculation pays for itself — it is the difference between a system that fits and one that short-cycles.
- Insulation in a shop or garage matters more than the equipment. Heating an uninsulated building is an expensive habit.
- Because the rest of the house works, the fault is local. That narrows it to duct work, a damper, a return path or a thermostat in the wrong room.
- A system that struggles everywhere is a whole-system question. One new head will not change it.
- With baseboards, each room already has its own control. Any replacement needs to keep that, which multi-head ductless does naturally.
- Starting from nothing is the easiest case to get right, because nothing has to be worked around.
- "A vent with nothing coming out" is measurable. We bring a hood and get a number rather than an opinion.
- No vent at all rules out balancing and rules in either new duct work or a head of its own.
- If you are not sure whether a duct reaches the space, that is the first thing to establish and it is usually quick.
What this cannot do: it does not size anything, it does not know your insulation, your glazing or your ceiling height, and it has not seen the crawlspace. Equipment should be sized from a load calculation, not from a web page and not from the label on the old unit.
Three things people are rarely told about ductless
- The indoor unit is visibleA wall head is a box on your wall. Floor-mounted and ceiling-cassette versions exist and cost more. Decide that before the quote, not after the install.
- It needs a condensate routeEvery head produces water when cooling. It has to go somewhere, by gravity or with a pump, and where that runs affects where the head can go.
- Filters are your jobThe filters in the head need rinsing regularly. A neglected head loses capacity and gets noisy, and that is not a fault.