DELLA Optima vs DELLA Serena
Different factories: DELLA Optima's certified ratings match models TCL certifies under its own name; DELLA Serena's certified ratings match models AUX certifies under its own name. DELLA Optima has 2 products on sale across 1 category. DELLA Serena has 5 products on sale across 1 category, priced $679.96 to $1,499.96. Largest system: 12,000 BTU/h (DELLA Optima 12,000 BTU 115V wall mount system) against 24,000 BTU/h (DELLA Serena 24,000 BTU wall mount system). Highest SEER2 (cooling efficiency): 23 (DELLA Optima 9,000 BTU 115V wall mount system) against 22 (DELLA Serena 9,000 BTU wall mount system). Highest HSPF2 (heating efficiency): 10 (DELLA Optima 12,000 BTU 115V wall mount system) against 10 (DELLA Serena 24,000 BTU wall mount system). Most heat at 5 °F: 8,900 BTU/h (DELLA Optima 12,000 BTU 115V wall mount system) against 20,800 BTU/h (DELLA Serena 24,000 BTU wall mount system). Keeps heating in the coldest weather: -13 °F (DELLA Optima 9,000 BTU 115V wall mount system) against 5 °F (DELLA Serena 9,000 BTU wall mount system).
At a glance
Who makes them?
Different factories: DELLA Optima's certified ratings match models TCL certifies under its own name; DELLA Serena's certified ratings match models AUX certifies under its own name.
DELLA Optima
2 of DELLA Optima's 2 ENERGY STAR certified systems carry certified ratings identical to models TCL certifies under its own name, which points to TCL as the maker (inferred from the certification records; not a statement by DELLA).
- TCL: 2 systems with identical certified ratings
DELLA Serena
3 of DELLA Serena's 3 ENERGY STAR certified systems carry certified ratings identical to models AUX certifies under its own name, which points to AUX as the maker (inferred from the certification records; not a statement by DELLA).
- AUX: 3 systems with identical certified ratings
Part by part
Matched by each product's size tier within its own line, so a row pairs each brand's compact, medium, large or XL piece. Tiers are for lining lineups up; the dimensions say how big each one really is.
Single-zone systems 2 vs 5
Questions
Are DELLA Optima and DELLA Serena made by the same company?
Different factories: DELLA Optima's certified ratings match models TCL certifies under its own name; DELLA Serena's certified ratings match models AUX certifies under its own name. How we work it out.
Which is cheaper, DELLA Optima or DELLA Serena?
On the prices we have (as of October 14, 2026), the cheapest DELLA Optima system is the 9,000 BTU 115V wall mount system at $899.96, and the cheapest DELLA Serena system is the 9,000 BTU wall mount system at $679.96. Prices are re-checked weekly.
Which has more products, DELLA Optima or DELLA Serena?
DELLA Optima: 2 products on sale across 1 categories. DELLA Serena: 5 across 1.
Which is more efficient at cooling, DELLA Optima or DELLA Serena?
By the brands' own figures: 23 for DELLA Optima (9,000 BTU 115V wall mount system) and 22 for DELLA Serena (9,000 BTU wall mount system). Seasonal cooling efficiency under the 2023 test procedure. Higher uses less electricity.
Which is more efficient at heating, DELLA Optima or DELLA Serena?
By the brands' own figures: 10 for DELLA Optima (12,000 BTU 115V wall mount system) and 10 for DELLA Serena (24,000 BTU wall mount system). Seasonal heating efficiency under the 2023 test procedure. Higher uses less electricity.
Which puts out more heat at 5 °F, DELLA Optima or DELLA Serena?
By the brands' own figures: 8,900 BTU/h for DELLA Optima (12,000 BTU 115V wall mount system) and 20,800 BTU/h for DELLA Serena (24,000 BTU wall mount system). Heat output with 5 °F outdoors, from the certification record. Published for units certified for cold climates.
Which keeps heating in colder weather, DELLA Optima or DELLA Serena?
By the brands' own figures: -13 °F for DELLA Optima (9,000 BTU 115V wall mount system) and 5 °F for DELLA Serena (9,000 BTU wall mount system). The lowest outdoor temperature the brand says it will still heat at. Output at that temperature is far below its rating.
Which has the better warranty if you install it yourself, DELLA Optima or DELLA Serena?
DELLA Optima publishes Kept on 2 of its 2 products; DELLA Serena publishes Kept on 5 of its 5 products. What the brand's warranty says when the owner installs the unit: kept, reduced, or void without a licensed installer. The quote is on the product page.
Answered from the catalogue data, as of October 14, 2026. How we compare.