(0)
Goodman
3.5 Ton Air Conditioner
Goodman Single-Stage, R-32 | GLXS3BN4210
$2,282.00
A 3.5 ton air conditioner produces 42,000 BTU and suits larger single-family homes in the 1,800 to 2,100 square foot range. Many buyers here are replacing an aging 3.5 ton system — and a lot has changed since the last one went in.
13 products
Goodman
Goodman Single-Stage, R-32 | GLXS3BN4210
Goodman
Goodman Up to 15.2 SEER2 Single-Stage, R-32 | GLXS4BA4210
Goodman
Goodman Up to 16.5 SEER2 Single-Stage, R-32 | GLXS5BA4210
Goodman
Goodman Up to 17.2 SEER2 Variable-Speed Side-Discharge, R-32 | GXV6SS4210
Ruud
Ruud 14.3 SEER2 Single-Stage, R-454B | RA14AY42AJ1NA
Ruud
Ruud 15.2 SEER2 Single-Stage, R-454B | RA15AY42AJ1NA
Trane
Trane 14 Series Single-Stage, 208-230V Three-Phase, R-454B | 5TTA4042A3000
Trane
Trane 14 Series Single-Stage, 460V Three-Phase, R-454B | 5TTA4042A4000
Trane
Trane 14 Series Single-Stage, R-454B | 5TTR4042A1000
Trane
Trane 15 Series Single-Stage, R-454B | 5TTR5042A1000
Trane
Trane 15 Series Single-Stage, WeatherGuard Top, R-454B | 5TTX5042A1000
Trane
Trane 16 Series Single-Stage, R-454B | 5TTR6042A1000
Trane
Trane 16 Series Single-Stage, WeatherGuard Top, R-454B | 5TTX6042A1000
If your current 3.5 ton unit is 10 or 15 years old, a like-for-like capacity swap still brings real upgrades. Efficiency standards have climbed, so a new unit at the same tonnage can cool for noticeably less. Refrigerant has changed too — older systems run R-410A (or the long-retired R-22), while new equipment ships with low-GWP R-454B or R-32 — which means the outdoor unit and indoor coil need to be replaced as a matched set, not mixed with old parts.
Upgrading an older 3.5 ton system? We'll help you match a complete set →
A 3.5 ton unit (42,000 BTU) generally covers larger single-family homes of about 1,800–2,100 sq ft, depending on climate, insulation, and layout.
Yes. Efficiency standards are higher, so a new unit cools for less, and refrigerant has shifted to low-GWP R-454B/R-32. You'll replace the outdoor unit and indoor coil as a matched set rather than reusing old components.
It's not recommended. An aging or mismatched coil undercuts the new unit's rated efficiency, can cause reliability problems, and typically voids the manufacturer's warranty. Replace the coil with the condenser.
Only if a load calculation points there. If your existing 3.5 ton kept the home comfortable and nothing major changed (insulation, additions, windows), matching capacity is usually the safe choice.
Usually, if it handled the old one — but it's worth confirming the ducts and blower move enough airflow, since undersized ducts can choke a system and hurt both comfort and efficiency.