Ductless Mini-Split Installation and Repair in Paoli, PA
The strongest case for ductless in Paoli is a house that has never had a duct in it. Where the heat comes from a boiler and radiators, adding conventional cooling is mostly carpentry: chases into corners, closets given up, plaster opened and made good. Ductless skips the carpentry, which is why so much of what we install in the older housing goes on a wall.
PJ MAC designs, installs and services ductless equipment across Paoli, Berwyn and Devon from our South Valley Road office. Installation estimates are free.
Ductless as the whole cooling system
In a radiator house the boiler often has plenty of life left, so the sensible project is cooling only, or cooling plus a shoulder-season heat source, rather than tearing out working heat. That usually means heads in the rooms carrying the load and the occupancy, not one in every room.
Sizing is where these projects go wrong, and the instinct is always to go too big. An oversized head cools the room quickly, satisfies, and shuts down before it has pulled meaningful moisture out of the air, leaving you at a comfortable number on the display and clammy in the chair. The advantage of an inverter compressor is that it runs slowly for long stretches. Oversizing throws that away.
Third floors, additions and back rooms
Converted third floors and finished attic spaces are the other recurring Paoli job. They sit at the top of a house full of rising warm air, under a roof with whatever insulation was practical at the time, and were served, if at all, by whatever the heating could reach. Enclosed porches and small additions are the same problem.
The details that decide whether the install is any good
- ✓Head placement chosen so the throw covers the room, not just where the line set runs easily
- ✓Condensate by gravity where the geometry allows, a small pump where it does not
- ✓Line set length and vertical rise kept inside the manufacturer limits
- ✓Outdoor unit raised on a stand or wall bracket, clear of snowmelt and slush
- ✓A dedicated circuit for the outdoor unit and a disconnect within sight of it
- ✓A line-hide cover outside, not bare insulated pipe stapled to the siding
What actually goes wrong on a mini-split
Ductless equipment gets almost no attention because it is quiet and out of the way, which is exactly why it develops problems. The blower in a wall head is a long, narrow squirrel cage, and in a humid summer it grows biofilm across the blades. That is the sour smell people describe in the first minute after the unit starts, and wiping the filter does nothing.
The other recurring items are flare fittings that were never torqued correctly and have leaked refrigerant since the day of the install, blocked drains that send water down the wall below the head, and outdoor coils blanketed by cottonwood in June. We service systems we did not install.
When ductless is the wrong recommendation
If a house already has sound ductwork and a working air handler, ductless is usually not the answer and we will say so. A room that is uncomfortable because of an unsealed attic hatch, missing insulation or failing windows will still be uncomfortable with a head on the wall. Just more expensively.
Paoli Mini-Split Installation — Questions We Get
Can ductless cool a whole house that has radiators and no ductwork?
Yes, and it is the most common reason we install it in the older Paoli housing. It is normally done with heads in the rooms that carry the load and the occupancy rather than one per room, which keeps the project proportionate and the equipment properly sized.
Should I get the biggest unit that fits the room?
No, and this is the single most common mistake. An oversized head satisfies the thermostat before it has removed any moisture, so the room reads cool and feels damp. Inverter equipment earns its keep by running slowly for long periods, and oversizing prevents it from ever doing that.
Why does my mini-split smell sour when it starts?
Biofilm on the blower wheel. The wheel in a wall head is a narrow cage that stays damp through a humid summer, and growth on the blades produces exactly that smell in the first minute of operation. Cleaning the filter will not reach it; the head needs to be opened and cleaned properly.
Do I have to give up my boiler if I install ductless?
Not at all. Most people here keep a sound boiler and use ductless for cooling and for shoulder-season heat, since a heat pump is at its most efficient in mild weather. If you want the ductless to carry real winter heating load, say so at the estimate, because it changes the sizing.
Where does the condensate water go?
Ideally it drains by gravity to the outside through the same wall penetration as the line set. Where the head sits below the practical drain point, a small condensate pump handles it. Water running down the wall under a head almost always means that drain is blocked or was never pitched correctly.
How much damage does the installation do to plaster walls?
Far less than ducting the house. Each head needs one penetration of roughly three inches for the line set, drain and control wiring, and the run outside is covered with a line-hide channel. That is normally the entire disruption to finished surfaces.
Who serves Paoli
Paoli calls are handled out of our Paoli office at 30 S Valley Rd #307, Paoli, PA 19301. Call (610) 424-6690 — we answer 24 hours a day.