Voltline is Vermont's heat-pump-only HVAC firm. Since 2019 we have installed 840+ cold-climate heat pumps across Chittenden County. Mitsubishi Hyper-Heat. Fujitsu Halcyon Extra Low Temp. Bosch IDS. We are the firm you call when you are ready to come off oil.
840+ Installs · 5 Years · 0 Gas Furnaces
Cold-climate heat pumps installed since 2019.
Coldest verified operating temperature without supplemental backup — Charlotte VT, January 2022 install.
Federal 25C + Efficiency Vermont + Green Mountain Power, stacked on a 3-ton install.
All-electric Ford E-Transit fleet, charging at the Pine St shop overnight.
For older Vermont homes without good duct infrastructure. One-zone, multi-zone, up through 5-head systems with a single outdoor unit. Discreet wall-mounted heads and modern cassettes.
We choose the indoor-head layout zone by zone with you at the site visit. The placement on the wall matters. We do not put a cassette in your living room without thinking about it.
For homes with usable forced-air duct infrastructure. Full-system replacement in the footprint of your existing furnace. The existing furnace is removed — we are not adding a heat pump to a fossil-fuel system.
Manual J load calc, Manual D static-pressure check on the existing ductwork, and a quiet inverter-driven air handler installed in the utility space.
The multi-phase package: heat pump + heat-pump water heater + 200A panel upgrade through our partner electricians at Stowe Electrical + induction-cooktop pre-wire + EV-charger pre-wire.
We sequence this over 6 to 18 months as your budget allows. The relationship matters more than the close.
An old-school heat pump used a single-speed rotary compressor and lost capacity below 17°F because the refrigerant cycle could not move enough heat against a large outdoor-indoor temperature differential. A cold-climate heat pump is a different machine. It uses a variable-speed inverter compressor with flash injection or enhanced vapor injection (EVI), which lets the compressor maintain refrigerant mass flow at low outdoor temperatures.
That changes the COP curve. COP — coefficient of performance — is the ratio of heating output to electrical input. A modern Mitsubishi Hyper-Heat unit holds COP > 2.0 down to −15°F outdoor. That means a kilowatt of electricity in still produces two kilowatts of heat out, even on the coldest night.
Below the published rated-capacity floor (typically −5°F to −15°F depending on the model), we configure either supplemental electric resistance strip heat (an electric coil in the air handler that engages automatically) or no backup at all when the building's heating load and equipment sizing make backup unnecessary. The strip backup is also electric — no fossil-fuel pieces in the system.
We are happy to bring the manufacturer's cold-climate performance data to the consultation. If you want to read the engineering before you call, our two long-form resource articles are here.
Removing the oil boiler in a 1968 cape.
Tom and Jenna replaced a 30-year-old oil boiler that was costing $4,400 a season. First heating bill on the heat pump: $182.
Case study →Lakefront renovation, no ductwork.
Mid-renovation lakefront home. Four indoor heads, one outdoor unit, ornamental-grass screen. Architectural-grade installation.
Case study →Off oil, off propane, all-electric.
Caleb just bought the house. Leaking oil tank. We did the full electrification stack over four months.
Case study →Voltline is led by Adrienne Beaulieu, a UVM mechanical engineer who installed oil boilers for nine years before deciding she wouldn't install one more. The firm employs eleven people, all paid a salary plus a project-completion bonus indexed to customer outcome at the one-year mark — not at the close.
Chittenden, Addison, Franklin, and Grand Isle counties — that's the regular service area. Washington County (Montpelier area) by quote.
Specifically: South Hero, Burlington, Williston, Essex, Colchester, South Burlington, Shelburne, Charlotte, Hinesburg, Underhill, Jericho, Richmond, Milton, Saint Albans, and the Lake Champlain islands.
TRAVEL TIME · SHOP TO SHELBURNE: 14 MIN · SHOP TO MILTON: 22 MIN · SHOP TO MONTPELIER: 38 MIN