How to Size Central AC for a Twin Cities Home
Why square-foot rules oversize Minnesota air conditioners, what a Manual J load calculation measures, and how to read the size of the AC you have now.
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AC Replacement in Stillwater, MN
West-side two-stories in Stillwater usually get a new condenser and matched coil, while plaster-walled houses on the hills without ducts suit small-duct high-velocity or ductless equipment. Central AC replacement runs $5,200–$9,800 installed with us, quoted flat-rate in writing after a Manual J.
AC replacement calls in Stillwater homes
What a new AC involves in Stillwater depends on which part of town you live in. In the west-side two-stories, the original builder condenser and coil come out together, a coil built for the new condenser's R-454B or R-32 refrigerant goes on the furnace, and the line set is checked for size and condition before we decide whether it stays.
On the hills, placement is the first question. A condenser on a designated historic property may need Heritage Preservation Commission review, and the least visible spot on a steep lot can mean a longer line-set run. Houses without ducts get small-duct high-velocity systems or ductless heat pumps rather than full-size ducts cut through plaster. A cold-climate heat pump is worth pricing in either kind of house. Xcel Energy supplies the electricity, and its heat pump rebates are tied to its Trade Partner Network of contractors, so confirm that requirement before you buy.
Updated September 23, 2026
How much does a new central AC cost in Stillwater?
A new central air conditioner from us runs about $5,200–$9,800 installed in Stillwater, sized with a Manual J load calculation. Same prices in Stillwater as in every town we serve. See the AC replacement cost guide or furnace and AC together.
Are there rebates for a new air conditioner in Stillwater?
Stillwater homes buy gas and electricity from Xcel Energy, which keeps the rebate picture simple. On the North and South Hills, the Xcel rebate that matters most is the one for high-efficiency gas boilers; on the west side it's usually a furnace, central AC or heat pump. Mini-split and cold-climate mini-split heat pumps, a common way to cool radiator homes, have their own Xcel rebates. Some Xcel rebates require a registered contractor, so ask before you choose equipment. Rebate programs change every year, so check the utility's current terms before you buy.
Our guides: Xcel and CenterPoint rebates, heat pump rebates.
Signs it's time to replace your AC
- An R-22 system with a refrigerant leak
- A failed compressor on an older unit
- A leaking evaporator coil on a system that's had other major repairs
- A system that has needed refrigerant more than once
- Upstairs rooms that never cool, even with the AC running all afternoon
- A house that reaches the setpoint but still feels damp
- Repair quotes that keep coming back for the same system
More detail on our ac replacement & installation page.
AC replacement in Stillwater: questions
Does a small-duct high-velocity system cost more than regular central air in Stillwater?
Usually, because the flexible tubing has to be fished through finished walls, closets and floors. National cost guides such as HomeGuide put a typical high-velocity small-duct system at $3,500–$15,000+ installed, depending on house size and how difficult the retrofit is. In a plaster-walled house on the hills it often beats cutting in full-size ducts, and we price it in writing after seeing the attic and closets.
Should we replace the original AC and furnace together in a west-side Stillwater two-story?
Often, if both came with the house. The coil sits on the furnace, so doing both lets us match blower, coil and condenser, size them together with one Manual J and set up one thermostat for the pair. If the furnace was already replaced and is healthy, we swap only the AC and adjust the blower for the new coil. We'll quote both ways so you can compare.
More in Stillwater
- Furnace repair in Stillwater
- Furnace replacement in Stillwater
- AC repair in Stillwater
- All HVAC service in Stillwater
AC replacement near Stillwater
- Oak Park Heights, MN 2 mi
- Bayport, MN 3 mi
- Grant, MN 5 mi
- Hudson, WI 6 mi
- Lake Elmo, MN 6 mi
- Mahtomedi, MN 7 mi
Brands we install and service
Guides on ac replacement
Carrier Performance vs Comfort Air Conditioners: What Differs
Carrier Comfort vs Performance AC: which models are single-stage or two-stage, published SEER2 and sound ratings, warranty rules, and Minnesota fit.
Read the guideHow Many Tons of AC Does a Minneapolis House Need?
AC tonnage for Minneapolis homes: a tons-to-BTU and airflow chart, why square-foot rules oversize, how to read your old unit's size, and what a Manual J does.
Read the guideContact Us
AC replacement in Stillwater? Call or send a request.