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AC Unit Replacement in Portland, ME
Replacing an AC unit means removing equipment that has failed or aged out and installing new equipment in its place. It's not the same as a new installation — the infrastructure is already there, but it still requires proper sizing, matching the new unit to your existing air handler, and verifying the refrigerant type is compatible. Equipment that's just swapped in without those checks often underperforms or fails early.
Portland AC Repair Pros provides AC unit replacement for homeowners across Portland, ME. Call for a free inspection and a written quote before any work begins.
When to Call
When You Need AC Unit Replacement
- Your outdoor compressor unit is over 15 years old and needs a major repair
- The repair estimate on your current system is close to half its replacement cost
- Your system uses R-22 refrigerant and has developed a leak that's not worth fixing
- The condenser coil or compressor has failed and the unit is discontinued
- You're seeing dramatically higher electric bills that point to declining efficiency
- Your current unit was improperly sized and has never cooled the home adequately
How It Works
Our Process for AC Unit Replacement
- 1
System Review
We look at what you have — equipment age, refrigerant type, air handler condition, and duct state. Not everything gets replaced at once, but we tell you what's worth keeping.
- 2
Proper Sizing Check
We don't assume the old unit was the right size. We recalculate cooling load. If the previous equipment was wrong, we correct it now rather than repeat the same mistake.
- 3
Equipment Selection
We match the new condenser to your existing air handler or recommend a coil replacement if needed for refrigerant compatibility. R-410A and R-454B equipment require matched components.
- 4
Removal of Old Equipment
We recover any remaining refrigerant properly, disconnect and remove the old unit, and dispose of it. We check the pad and electrical connections before setting the new unit.
- 5
Installation and Line Check
New refrigerant lines are always recommended on older systems. Reusing old lines risks contamination. We discuss this with you before the job — it affects cost but protects the new equipment.
- 6
Startup and Verification
We charge to spec, run through all operating modes, and check temperatures at the registers. We make sure everything is working before we call the job done.
What's included
- Full removal and proper disposal of the old outdoor condenser unit
- Refrigerant recovery from the old system before removal
- Installation of the new condenser unit on existing or new pad
- Electrical connection and disconnect inspection at the new unit
- Refrigerant charge to manufacturer spec and system performance verification
- Assessment of indoor coil compatibility with new equipment and refrigerant type
What's not included
- Air handler or furnace replacement if the existing unit is incompatible — that's a separate quote
- New refrigerant line sets — recommended on older systems but quoted as an add-on
- Ductwork repairs or modifications discovered during the process — addressed separately
Real Situations
Common Scenarios in Portland
A homeowner in Cape Elizabeth has a 17-year-old outdoor unit that stopped running in late June and their repair tech told them the compressor is gone.
A failed compressor on a unit that age is almost always a replacement conversation, not a repair. We confirm the diagnosis, check whether the indoor coil is worth keeping, and size the new unit correctly. We're transparent about whether the coil needs to go too.
A Scarborough homeowner has an R-22 system that's been slowly losing charge every year, and the refrigerant cost keeps climbing.
R-22 is no longer manufactured, and recharging a leaking system is throwing money at a dead end. We walk through the full replacement scope — outdoor unit, indoor coil, and likely line sets — so there are no surprises partway through the job.
A homeowner in the Rosemont neighborhood replaced their own condenser unit years ago with an oversized model they found on clearance, and it's never worked right.
Oversized equipment short-cycles, which means poor dehumidification and excess wear. We size correctly, swap in the right unit, and explain what was happening so they understand the fix.
Portland Context
Why this matters in Portland
A lot of Portland-area homes had central AC added in the 1990s and early 2000s when the technology became more affordable for the region's climate. Those systems are now hitting the end of their useful lives in large numbers. Many also used equipment that was slightly oversized for the home, which accelerated wear. Replacement in these cases is often a chance to correct original installation mistakes.
Straight Talk
About pricing & scope
The cost of a replacement depends on whether the indoor coil stays or goes, whether new line sets are needed, and whether any electrical work is required. Systems using older refrigerants almost always need the full indoor and outdoor components replaced together. We tell you what's actually needed before ordering anything.
What This Fixes
Problems We See in Portland
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