Heat Pump Installation in Vermont - Cold-Climate Certified

A heat pump installation is only as good as the contractor who designs it. Vermont’s climate is not forgiving – we reach sustained temperatures below -10°F multiple times each winter in Chittenden County, and a system sized for a Maine coastline home or a Connecticut ranch will underperform here. I’ve been installing cold-climate heat pumps in Vermont since before most contractors in this state understood what a -13°F rated system was. The difference between a system that works and one that leaves you cold in January comes down to two things: brand selection and heat load calculation.

Heat Pump Installation in Vermont

We install exclusively Mitsubishi and Daikin systems. Not because every other brand is inferior, but because these two manufacturers have the deepest cold-climate product lines, the strongest warranty programs, and the most comprehensive installer certification systems. My Mitsubishi Diamond Elite certification and Daikin dealer certification mean I've been factory-trained on these systems - not just shown a brochure.

Jamie Langlois Owner

How We Size Every Heat Pump Installation

Before we quote a system, we calculate your home’s heat load using ACCA Manual J methodology. This takes into account your home’s square footage, insulation values, window area and orientation, air leakage rates, and local design temperatures. Vermont’s 99th percentile design temperature in Burlington is -7°F – that’s the temperature we design to, not an industry average.

An oversized system short-cycles, meaning it turns on and off too frequently without completing a full heating cycle. Short-cycling wastes energy, creates humidity problems, and accelerates compressor wear. We’ve seen heat pumps fail in 7 years that were designed to last 15 – every time, the root cause was oversizing by a contractor who skipped the Manual J. We don’t skip it.

Ductless vs. Ducted Heat Pumps

What It Means for Vermont

Ductless Mini-Split Installation

the right choice for homes without existing ductwork, for additions and bonus rooms, and for zoned comfort in specific areas. A single outdoor unit can serve one to five indoor units, each independently controlled. Installation is minimally invasive - a three-inch hole through the exterior wall, a refrigerant line set, and electrical connections.

Central Heat Pump Installation

work through your existing ductwork, replacing or supplementing a gas furnace or air handler. If your home already has forced-air ducts in reasonable condition, a ducted heat pump is often the most efficient whole-home solution. It delivers both heating and cooling through the same distribution system you already have.

Mitsubishi vs. Daikin Our Honest Take

Both brands are excellent. The choice usually comes down to your application and zoning needs.

Mitsubishi's H2i technology

leads the industry in low-ambient performance - the Mitsubishi MSZ-FS09NA operates at 100% rated capacity down to 5°F and maintains output at -13°F. For Vermont homes where Langlois Plumbing, Heating & AC LLC - Website Developer Guide v6.0 Page 18 extreme cold is a regular occurrence, Mitsubishi is our first recommendation.

Daikin's Aurora series

Daikin's Aurora series offers competitive cold-climate performance and is often the better fit for ducted whole-home applications. Daikin's AURORA heat pump is rated to -13°F with an industry-leading 18 SEER2 rating.

Vermont Heat Pump Rebates and Incentives

Vermont homeowners installing qualifying heat pumps can access rebates through Efficiency Vermont, the federal Inflation Reduction Act tax credit (30% of installation cost, up to $2,000), and in some cases Burlington Electric Department incentives. In our experience, the total incentive package reduces the net installation cost by $1,500–$3,500 on a typical ductless installation. We help every customer identify which rebates apply before the installation date

What a Heat Pump Installation With Us Looks Like

Free assessment

We visit your home, evaluate the space, and calculate the heat load. No charge.
System recommendation

We present one to two options with pricing, rebate estimates, and payback
calculations.
Scheduling

Installation date set within 1–2 weeks in most cases.
calculations.
Installation day

One to two days depending on complexity. We protect floors and work areas, clean up
completely before we leave.
Commissioning

We test every function - heating, cooling, dehumidification, fan speeds - before leaving.
Rebate filing

We provide all documentation you need to file your Efficiency Vermont and federal rebate
claims.

Frequently Asked Questions

Will a heat pump be my only heat source, or do I still need a backup?

For most Vermont homes, a properly sized cold-climate heat pump can serve as the primary heat source. Modern Mitsubishi and Daikin systems maintain output down to -13°F, which covers the vast majority of Vermont heating hours. For nights below -15°F or for homes with very poor insulation, we often recommend a small electric resistance backup element or retaining an existing boiler as a supplement. We make this recommendation per-home, not as a blanket policy.

How much will my electric bill increase after installing a heat pump?

Your electric bill will increase, but your total energy bill - electric plus fuel - will decrease significantly for most Vermont homeowners. A heat pump's coefficient of performance (COP) at 20°F is typically 2.0 to 2.5, meaning it delivers 2 to 2.5 units of heat for every unit of electricity consumed. Oil heating has a COP of approximately 0.85. The math favors the heat pump in almost every scenario except the coldest hours of the coldest nights

My house is 1,800 square feet. What size heat pump do I need?

There is no reliable square-footage formula for Vermont homes. A 1,800 sq ft home with 1980s insulation and single-pane windows has a completely different heat load than a 1,800 sq ft home built to 2020 energy code. We calculate your heat load before recommending a size - that's the only honest answer to this Langlois Plumbing, Heating & AC LLC - Website Developer Guide v6.0 Page 19 question.

Do heat pumps work well in older Vermont farmhouses?

They work, but the installation design matters more. Older farmhouses often have higher air leakage and lower insulation values, which increases the heat load. We size accordingly and often recommend supplemental improvements - additional weatherstripping, attic insulation - that increase the system's efficiency and your overall comfort. In our experience, farmhouse owners who seal air leaks before installing a heat pump see 20–30% better performance than those who skip that step.

What warranty comes with a Mitsubishi or Daikin heat pump?

Mitsubishi offers a 12-year parts and compressor warranty when installed by a Diamond Elite contractor (which we are). Daikin offers a 12-year parts warranty on systems installed by a registered dealer (which we are). Labor warranty is provided by us separately. These are some of the best warranties in the industry - and they require certified installation to be valid, which is another reason to verify your installer's credentials.

Schedule Your Free Heat Pump Assessment

We serve Burlington, Essex, South Burlington, Colchester, Williston, and all of Chittenden County. Call (802) 233-0790 or request your free assessment online.

Heat Pump Installation in Vermont - Cold-Climate Certified