NORTHLINE

What we work on

Four kinds of work, each priced in writing. The words in the margins are the ones you will see on the quote.

Sheet metal supply duct stencilled SUPPLY

Furnace install and repair

Single-stage, two-stage and modulating gas furnaces. Replacement starts with a Manual J load calculation so the new furnace is sized to the house you have now, insulation and windows included.

Repairs we see most: failed hot-surface igniters, dirty flame sensors, tripped limit switches, cracked inducer housings and blocked condensate drains on high-efficiency units.

Terms for Furnace install and repair
AFUEShare of fuel turned into heat in the house.
BTU/hHeat output or input per hour, printed on the nameplate.
ECMA variable-speed blower motor that ramps instead of slamming on.

Price a furnace

Outdoor heat pump unit on a lawn beside a house

Heat pumps, ducted and ductless

Ducted heat pumps on existing ductwork, ductless mini-splits for rooms the ducts never reached, and dual-fuel pairings that keep a sound furnace as backup.

Every heat pump quote names the balance point: the outdoor temperature where the system needs help, and what provides it.

Terms for Heat pumps, ducted and ductless
HSPF2Heating efficiency rating for heat pumps, 2023 test procedure.
Balance pointOutdoor temperature where heat pump output equals the house's heat loss.
DefrostThe cycle that clears ice from the outdoor coil in cold, wet weather.

Price a heat

Technician working inside an open condenser cabinet

Central air conditioning

Condensers and evaporator coils matched as a rated pair, line sets replaced when they are undersized or carry the wrong refrigerant, and condensate handled so it does not end up on the basement floor.

Repairs: capacitors, contactors, refrigerant leaks found and fixed before recharging, and frozen coils traced to their real cause.

Terms for Central air conditioning
SEER2Cooling efficiency rating, 2023 test procedure.
TonnageCooling capacity; one ton is 12,000 BTU/h.
Line setThe two copper lines between the outdoor unit and the indoor coil.

Price a central

Bundles of round metal ductwork running along a ceiling

Seasonal service

A furnace check before the first cold week and an air conditioning check before the first hot one. Filters, burners, flame sensor, safeties, static pressure, refrigerant pressures and the condensate path, written down so the next visit can compare.

Pricing and plan terms: owner supplies. We do not sell a plan we cannot describe on one page.

Terms for Seasonal service
Static pressureAir resistance in the ductwork; high readings shorten blower life.
MERVFilter rating; higher catches more and restricts more.

Price a service visit

Get a written price