One room. One weekend. Comfortable all year.
A bedroom that bakes in July, an office over the garage, a finished basement that stays clammy. One MRCOOL® DIY mini-split fixes it — and you install it yourself in an afternoon.
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Length × width. Add 10% for high ceilings or lots of sun.
Measure along the route the line will take, then pick the next length up.
Or pick a system yourself
Pick your one-room system.
Complete single-zone MRCOOL® DIY units — pre-charged and ready to ship from our Canadian warehouse.
Not sure on size? A 9–12K BTU unit suits most single rooms up to ~500 sq ft.
up to 350 sq ft
up to 500 sq ft
450–750 sq ft
700–1,000 sq ft
1,000–1,400 sq ft
What MRCOOL® owners say
264 reviews of the MRCOOL® DIY 5th Gen 12K single-zone system
Read them all at The Home Depot (U.S.) →“No more putting window units in and removing them in the fall.”
“The outside unit is very quiet, can hardly hear it running.”
Reviews are of the MRCOOL® product, posted by buyers at The Home Depot (U.S.), and are not reviews of Dr.Climate.
How it works
A single-zone system you actually install yourself.
MRCOOL® DIY single-zone mini-splits ship pre-charged with Quick Connect® line sets. No vacuum pump, no gauges, no refrigerant handling, no HVAC licence. Mount the head, set the condenser, hand-tighten the fittings, power on.
Size it
9–12K BTU covers up to ~500 sq ft — a bedroom, office, garage or addition.
Mount it
Hang the indoor head, set the condenser on a pad or bracket.
Connect it
Hand-tighten the pre-charged line set — leak-free, no vacuum.
Run it
Flip the breaker, pair the app, heat and cool year-round.
Why bother
You don't need to cool the whole house. You need to fix one room.
Central air can't zone a single space, window units are loud and leak heat, and portable ACs drain into buckets you have to empty. Meanwhile the one room you actually live in stays 5–8°C off from the rest of the house.
Why not call a contractor
And the usual fix costs more than the problem.
Call a contractor for a single-zone mini-split and the quote lands at $3,500–$6,000 — most of it labour for a job that takes a trained tech a few hours. So the room stays uncomfortable, or you overpay to fix it.
The payoff
One quiet, efficient, app-controlled room — installed this weekend.
Fix that room this weekend.
Add a single-zone system to your cart now, or use the BTU guide to confirm your size first.