AC Installation in Longview, WA
Tell us about the house, and a licensed contractor who covers Cowlitz County will get in touch.
Tell us about the job
It takes about a minute.
Longview doesn't ask much of an air conditioner
Summer afternoons here average just 74°F. That's mild, and it means a new air conditioner in Longview isn't fighting the kind of heat that pushes a system hard.
Any new central air conditioner installed today has to meet a federal minimum of 13.4 SEER2, so efficiency is covered no matter which unit goes in. With hail this small and wind events on record but infrequent, the bigger question for your installation is sizing it right for your house, not building in extra capacity for heat that doesn't show up here.
- 74°F
- the average summer afternoon it cools against
- 1 hail events
- in ten years, and hail bends the fins on outdoor coils
- 13.4 SEER2
- the federal minimum any new unit must meet

NOAA nClimDiv, 1991–2020 normals
Going above the federal minimum saves little here, about $10 a year.
Estimates for a typical Cowlitz County home, from EIA household energy data, Washington fuel prices and NOAA climate normals. Your home will differ.
Washington requires contractors to register with the state.
That registration puts the contractor's business on file with the state. There's no trade exam behind it, so it tells you the business is on record, not that the state has checked what they know or tested their work.
For an air conditioner install, the protection that matters most here is local. In most cities and counties, a job like this needs a permit from the building office, and the finished work gets inspected before it's signed off. That inspection is what checks the installation itself, since the state registration doesn't cover that.
Source: Washington State Legislature
- What size air conditioner does my house need?
- The right size depends on your home's square footage, insulation, window area and layout, not on a rule of thumb. A contractor works this out with a load calculation rather than guessing from house size alone. An oversized unit cools the air fast but shuts off before it pulls the humidity down, and an undersized one runs constantly without keeping up. Given how mild summers run here, with afternoons averaging 74°F, many homes get by on a smaller system than you'd expect in a hotter climate. A contractor can walk through your house and size it properly.
- Should I replace the whole system or just the outdoor unit?
- If your indoor coil and outdoor unit are matched and both working, replacing just the outdoor unit can make sense. But an old indoor coil paired with a new outdoor unit often doesn't perform the way the new unit is rated to, and some manufacturers won't warranty a mismatched pair. Age matters too. If both units are old, replacing one now usually means replacing the other within a few years anyway. A contractor can check whether your coil and unit are compatible before you decide.
- Do HVAC contractors in Longview need a state license to work on my home?
- Washington requires contractors to register with the Department of Labor and Industries, but this is a business registration, not a trade license. There's no state trade exam behind it. What you should check instead is that the contractor is properly registered and, since installing an air conditioner needs a permit from the local building office, that they pull the permit and get the work inspected when it's done.


