Heating and Cooling a Home Without Ductwork: The Ductless Answer
Quick answer: a home without ductwork can be heated and cooled room by room with a Mitsubishi ductless system: an outdoor unit connected by a small refrigerant line to wall-mounted, ceiling-recessed or floor-mounted indoor units, with no ducts, no chases and a three-inch hole per room. Whether you are fixing one hot or cold spot, renovating, adding on, or replacing a boiler in an 1800s farmhouse, no ductwork is no problem. The Hyper-Heating versions deliver full heat at 5°F and run to -13°F or -22°F, so the system that adds air conditioning to a Crown Point farmhouse also carries it through January.
The North Country housing problem
Most homes in Essex, Clinton and Franklin counties were built around a boiler, a woodstove or electric baseboard. There are no ducts, no chases and often no attic or basement space to add them without opening walls and ceilings. That is why so many homes here have never had central air, and why replacing the boiler has always meant another boiler. A ductless system changes the equation.
What a ductless system consists of
Just a few main parts:
- An outdoor unit on a stand or wall bracket above snow depth
- Indoor units, one per zone, in the style that fits the room: wall-mounted (MSZ-FS and GL), ceiling-recessed cassette (MLZ EZ FIT), or floor-mounted (MFZ)
- A line set carrying refrigerant, power and condensate through a single small wall penetration, run in a neat exterior cover
- Controls: remote, MHK2 wall thermostat or the Mitsubishi Comfort app
The indoor units sense room conditions continuously and the inverter-driven outdoor unit adjusts output to use only the energy demand requires, so the room holds one temperature instead of swinging. Installation is simpler and uses fewer materials than any ducted system, which is why most single-zone installs take a day.
Preserving an older or historic home
Ductwork is the enemy of plaster walls, wide-board floors and original trim. A ductless system limits disruption to a home's existing architecture, which is exactly what matters in a village Victorian in Ticonderoga, a lakeside camp from the 1920s or an 1850s farmhouse outside Westport. Line sets run along the exterior in painted covers or through a closet; indoor units mount high on the wall or recess between joists; nothing structural changes.
A textbook case: a 2,200-square-foot manor house built in 1814 and listed on the National Register had never had reliable whole-home heating or air conditioning. Window units and space heaters could not keep up, and the owners feared a traditional HVAC system's weight and duct runs would damage 200-year-old brick. The answer was a ductless multi-split: five floor-mounted and two wall-mounted indoor units now condition eight zones, quietly enough for the tours and weddings the house hosts, and the original structure carries on with a few modern upgrades. We see the same story in Adirondack homes a century younger.
Reliable in extreme conditions
Mitsubishi ductless systems deliver energy-efficient heating and cooling even in extreme ambient conditions. The Hyper-Heating INVERTER (H2i) models we install hold 100% of rated heating capacity at 5°F and keep operating to -13°F, with H2i Plus models reaching -22°F, so a ductless system is primary heat in Ticonderoga, not a supplement. If you are keeping an existing boiler or woodstove, think of the air conditioning as the bonus. Every ductless unit also has washable, easy-to-reach filters, so maintenance is a ten-minute job; see cleaning your filters.
Zoning: the biggest benefit
Perhaps the most significant advantage of going ductless is zoning. With a multi-zone outdoor unit you can connect up to eight indoor units and give every room its own setpoint. Keep the living room at 70°F, the bedrooms at 64°F, and turn the guest room off entirely until company arrives, without affecting the rest of the system. For a house that used to be heated to one temperature by a boiler, that is where much of the savings shows up. Read our ductless mini-split page and the best applications for one.
What it costs, and what helps
A ductless system avoids the single largest cost of adding central air or a ducted heat pump to an old house: building a duct system. Cold-climate ductless equipment qualifies for NYS Clean Heat incentives through NYSEG and National Grid, and Efficiency Vermont across the lake; we confirm the amount and file the paperwork. Financing is 18 months at 0% through Synchrony, and completing the savings calculator before your estimate earns $250 off. See rebates and savings.
Frequently asked questions
Can you add central air to a house with no ductwork?
Not without building ducts, which is expensive and invasive in an older home. A ductless Mitsubishi system cools and heats room by room through a small refrigerant line instead, with no ducts at all.
How many rooms can a ductless system serve?
A multi-zone outdoor unit runs up to eight indoor units, each its own zone. Larger homes use two outdoor units. Open living areas are often covered by one well-placed unit.
Does a ductless system damage walls in an old house?
No. Each indoor unit needs a three-inch hole for the line set, which runs outside in a painted cover or through a closet. Plaster, trim and floors are untouched.
Will ductless heat work in an uninsulated farmhouse?
It will work, but it will work harder. We size to the home's actual heat loss and recommend air sealing and attic insulation first where it will lower the system size and the electric bill.
Talk to us
Have questions about your home? Call Adirondack Heat Pumps at (518) 812-1958, stop by the showroom at 15 Montcalm Street in Ticonderoga, or request a free in-home estimate. We serve Essex County, the Lake George and Lake Champlain shores, the High Peaks and Addison County, Vermont.