- Qualifies if
- A single-zone mini-split rated 17,000-18,500 BTU of cooling with a stated SEER2.
- Ranked by
- SEER2 (maker) (highest first)
- Shown
- The top 8 of 16 products in our catalog that meet the rule.
DELLA Optima 18,000 BTU 230V
The highest SEER2 (23) of the 16 mini-splits of this size we cover.
DELLA Serena 18,000 BTU 230V
22 SEER2, the 2nd best among similar-size systems we cover.
Rellytech 18,000 BTU 230V Mini-Split
21 SEER2, the 3rd best among similar-size systems we cover.
DELLA Vario 18,000 BTU 230V
21 SEER2, the 3rd best among similar-size systems we cover.
YITAHOME 18,000 BTU 230V Mini-Split
21 SEER2, the 3rd best among similar-size systems we cover.
TOSOT 18,000 BTU 230V Mini-Split
20 SEER2 with 230V power and R-410A refrigerant.
ROVSUN 18,000 BTU 230V Mini-Split
20 SEER2 with 230V power and R-32 refrigerant.
Cooper & Hunter MIA 18,000 BTU 230V
19.2 SEER2 with 230V power and R-454B refrigerant.
How to choose between them
Size to the room first: the ENERGY STAR chart, adjusted for sun, ceiling height and climate, decides the BTU. Our BTU calculator does it for you and lists the systems in range.
SEER2 is the maker's seasonal cooling efficiency under the 2023 DOE test; each point higher cuts cooling energy by roughly 5% at the same output. Heating efficiency (HSPF2) and the low-temperature rating matter more in cold climates.
Rankings follow the rule and order stated above, using makers' published specifications and listed prices. How we research · Disclosure