Rellytech 18,000 BTU Mini Split

In this rellytech 18,000 btu mini split review, the short answer is that this unit wins on capacity per dollar. It ranks fourth in our 2026 guide to the best ductless mini splits, where it earns the label of best high capacity budget pick. The Rellytech Mini Split CE0-1 delivers 18,000 BTU of cooling and 18,400 BTU of heating across up to 1,250 square feet, and it sells for $489.99. That combination explains why 346 Amazon shoppers have handed it a 4.4 star average. Buyers who need to condition a large bedroom, a garage office or an open living area should start here. Meanwhile, anyone who wants long warranty coverage or a simple plug-in install at 115V should look elsewhere.

On paper, the performance numbers explain the appeal. A 19 SEER2 rating and an HSPF2 of 8.5 mean the inverter compressor ramps up and down instead of switching fully on and off, so room temperature stays steady. In practice, four modes (cool, heat, fan and dry), four fan speeds and a 90 degree vertical swing push air exactly where you need it. The indoor head runs as quietly as 26 dB, roughly a whisper, which suits a bedroom or a home office. Eco mode trims compressor output to hold efficiency, and sleep mode softens the fan overnight. Rated draw is 1,700 watts on 208-230V power, so a dedicated 230V circuit is required. Annual energy consumption is listed at 2,030 kWh per year, and the indoor unit measures 12.4 inches deep, 39.6 inches wide and 9.5 inches high.

The value story holds up when you weigh capacity against price. At $489.99 for 18,000 BTU, the Rellytech tops this lineup for BTU per dollar, and it also carries a 4 Star BEE rating. By contrast, the Senville and COSTWAY models in our guide back their systems with longer warranty coverage, so read those terms if coverage matters to you. Rellytech includes only a 1 year limited manufacturer warranty, the shortest in the group. Even so, the box is complete: the indoor and outdoor units, a remote with two AAA batteries, two 9.84 ft connecting pipes, a 12.5 ft communication cable, a 6.56 ft drain pipe, a mounting plate, screws and anchors. However, this is a split system with a 112 pound outdoor unit, so plan for a licensed installer and a proper vacuum. If you want the most cooling per dollar, this is the one to get.