AC install
AC Install in Whitehall, MT
Cooling that actually pulls a house down on a 95-degree afternoon — sized from a load calculation, matched correctly, and commissioned with gauges instead of assumptions.

Sizing matters more than brand
Air conditioning does two jobs: it lowers temperature and removes humidity. An oversized unit satisfies the thermostat before it has run long enough to dehumidify, so the house feels cold and damp and the compressor wears out from short cycling. An undersized one runs all afternoon and never catches up.
We calculate the cooling load from your building — window area and orientation, insulation, air leakage, ceiling heights — and check it against what your ductwork can move. That number picks the equipment, not the size of whatever was there before.
Commissioning is the part that gets skipped
An air conditioner installed with the right nameplate but the wrong charge will underperform for its entire life. We pull a proper vacuum on the line set, weigh in the charge, then verify with superheat and subcooling under real load rather than trusting the factory precharge.
Airflow gets the same treatment: static pressure measured, blower speed set for the duct system you have, and delivered temperature split checked at the registers. You get the numbers, so any future technician has a baseline to compare against.
What a clean install looks like
A level pad set clear of roof drip and snow load, line set insulated and supported, a properly sealed coil cabinet, a service disconnect where code requires it, condensate with a trap and a safety switch, and a whip run neatly rather than draped.
Details like these are why one install runs quietly for fifteen years and an identical unit next door fails in six.
Local knowledge
Built for Whitehall and the Jefferson Valley
Montana summers are short but genuinely hot, and afternoons above 90 with low humidity mean equipment sized for a humid climate behaves differently here. Our sizing accounts for the dry-bulb swing and the big day-to-night temperature drop, which is why staging and blower settings matter locally.
Wildfire smoke in late summer is the other local factor. It loads filters fast and coats coils, so we set filtration up to be serviceable and, where it makes sense, recommend coil protection to keep capacity through smoke season.
Questions & answers
Frequently asked questions
How long does an AC install take?+
Typically one day when the ductwork exists and the indoor coil goes on an existing furnace. Adding a line set to a home that never had cooling, or reworking plenums, can extend it to two.
Do I need a new furnace to add AC?+
Not necessarily. If your furnace blower can move the airflow the new coil needs and has enough life left, we install the coil on it. We measure before recommending anything.
What size air conditioner do I need?+
That comes from a load calculation, not square footage. In this climate most homes need less capacity than people assume, and oversizing causes the clammy, short-cycling behavior homeowners blame on the brand.
Is the quote free?+
Yes. We measure, calculate the load, and give you a written price at no cost. Call (406) 266-1675.
Related services
Other work we do nearby
AC Repair
Warm air, a condenser that won't start, iced coils or a breaker that keeps tripping — found and fixed fast.
AC Maintenance
Spring tune-ups that catch weak capacitors and low charge before the first 90-degree afternoon does it for you.
Air Conditioning Install
Adding cooling to a home that never had it, or replacing a tired system — line sets, coils, condenser pads and clean commissioning.
Air Conditioner Repair
Refrigerant leaks, failed contactors, blower faults and control problems diagnosed with gauges and meters, not guesses.
Air Conditioner Maintenance
Coil cleaning, drain care, electrical checks and performance testing to protect capacity and keep power bills sane.
Heater Install
New heating equipment selected and installed for real Montana design temperatures — gas furnaces, unit heaters and add-on heat for spaces ductwork never reached.
Price a properly sized AC install
Call (406) 266-1675 or request a free quote. We'll calculate the load, check your ductwork, and give you a written price for AC installation in Whitehall and the surrounding valley.
