Single splitSEER2 18 Heats too
MRCOOL · Model DIY-36-HP-WM-230D25-O
MRCOOL · Model DIY-36-HP-WM-230D25-O
A wall-mounted split air conditioner rated at 36,000 BTU for rooms up to 1,550 sq ft. It heats in winter too.
$3,469
Live price at SylvanePrice checked Sep 30, 2026
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Based on 53 prices we have recorded since Jul 25, 2026, not a market average.
Will it cool your room?
This unit's cooling matches a 861 sq ft room. Set your room size to check the fit for your space.
Mini-splits are rated on SEER2, a seasonal scale, not the ENERGY STAR annual-kWh figure this dollar estimate is built from, so there is no comparable figure to show here. A blank is missing data, not a worse result: a mini-split is often the more efficient choice.
At a glance
Best for larger open-plan rooms.
EER2, SEER2, warranty, heating capacity, refrigerant, heating limit and outdoor unit size are from Sylvane's published specifications for this exact configuration, checked Sep 26, 2026.
This is a single split. This is where regulation bites. Under EPA Section 608 the refrigerant circuit may only be opened by a certified technician, and the EPA is explicit that this includes connecting or disconnecting the pre-charged line sets sold with "DIY" mini-split kits. No federal law stops you doing the mounting, bracketing and line routing yourself, but handling the refrigerant without certification voids the warranty and is a violation. Most US jurisdictions also require permits for a new outdoor unit: typically mechanical or building for the wall penetration and mount, plus electrical for the dedicated 240 V circuit and disconnect. An HOA nearly always has to approve exterior equipment in advance, and local noise ordinances can cap how loud the condenser may be at the property line. This varies by city and county, so confirm with your building department before buying hardware.
DIY kit, certified refrigerant hookup
R-454B
Compare splits against the other types on price, noise, efficiency and install.
The questions buyers ask, answered from live prices and real specs. See where a single split like this fits.
MRCOOL
The MRCOOL DIY 5th Gen 36K is the largest single-zone DIY ductless heat pump, rated 18 SEER2 on R-454B and sized for very large rooms. It trades the higher efficiency of the smaller DIY units for raw 3-ton capacity.
$3,299
Hardware price
MRCOOL
A wall-mounted split air conditioner rated at 24,000 BTU for rooms up to 1,050 sq ft. It heats in winter too.
MRCOOL
The MRCOOL DIY 5th Gen 24K is a 2-ton single-zone ductless heat pump rated 22.7 SEER2 / 12.7 EER2 / 9.5 HSPF2 on R-454B, sized for spaces of roughly 750 to 1000 sq ft. MRCOOL sells it as a do-it-yourself kit with a pre-charged line set, but under EPA Section 608 connecting the refrigerant lines is certified-technician work.
$3,029
at Sylvane
Lowest since Jul 25, 2026 $3,029$2,929
Hardware price