Mini Split for 1,850 Sq Ft: Size, Cost & Systems
At the standard 20 BTU per square foot baseline, a 1,850 sq ft space needs about 37,000 BTU of cooling, which lands in the 36,000 BTU class on the standard sizing chart. Our dataset holds 2 verified system(s) here, 2 with first-hand prices from $3,469 to $4,538; the cheapest is the MRCOOL DIY 5th Gen 36k.
Computed from our dataset
- 2 system(s) from our verified dataset appear on this page.
- Price range: $3,469 to $4,538 (verified 2026-11-04).
- Cheapest: MRCOOL DIY 5th Gen 36k at $3,469 (Sylvane).
- Highest SEER2: MRCOOL DIY 5th Gen 3-Zone 36k (9+9+18) at 23 SEER2.
- Best heating rating: MRCOOL DIY 5th Gen 3-Zone 36k (9+9+18), rated to -13°F.
| System | Zones | BTU | Coverage | SEER2 | Heats to | Install | Price | |
|---|---|---|---|---|---|---|---|---|
| MRCOOL DIY 5th Gen 36k DIY-36-HP-WM-230D25-O | 1 | 36,000 | up to 1,550 sq ft | 18 | — | Pro / flare | $3,469 at Sylvane | Check price |
| MRCOOL DIY 5th Gen 3-Zone 36k (9+9+18) DIY-MULTI5-36HP230D | 3 | 36,000 | Per-zone: 400 / 400 / 1,000 sq ft | 23 | -13°F | Pro / flare | $4,538 at HVACDirect | Check price at HVACDirect |
Buying notes
- The 20 BTU/sq ft baseline assumes 8-9 ft ceilings, average insulation, and a moderate climate; the sizing guide lists the adjustments (sunrooms run 30-35 BTU/sq ft, kitchens add ~4,000 BTU).
- Oversizing an inverter system slightly is low-risk (it modulates down); oversizing a lot short-cycles and leaves humidity behind.
- If this space is one room of several, compare a multi-zone system before buying a big single-zone - one condenser can serve several handlers.
- At this size you are at the top of single-condenser residential systems; a 2-zone or two single-zone systems often balance a large open space better than one 48k head.