36"W x 19"H 1.5-Ton Thru-Wall R-454B Condenser Replaces Aerosys TTWC-R18P21, TTWC-R18P21LX, VCU-C-018-1-S, VCU-C-018-1-X

Aerosys has permanently closed. This is the replacement. It is custom built to fit the same 36" W x 19" H sleeve you already have, on the same 208-230V single-phase service, charged with R-454B rather than the phased-out R-454B. Lead time is 14 to 21 days, built to order. Not sure which model you are replacing? The Aerosys replacement cross-reference lists every discontinued model and what it maps to.

A 1.5-ton thru-wall condensing unit built as a direct replacement for the Aerosys TTWC-R18P21, TTWC-R18P21LX, AboveAir VCU-C-018-1-S, and VCU-C-018-1-X. Same 36" W x 19" H NYC wall sleeve footprint, same 208-230V/1Ph electrical service, same R-454B refrigerant. It fits into the existing opening without modifying the sleeve, the facade, or the refrigerant lines already routed to the apartment’s indoor air handler.

At 1.5 tons / 18,000 BTU, this is the right size for bedrooms, studios, and smaller one-bedrooms in the 400 to 700 square foot range, the most common apartment size across the NYC rental and co-op market. Building engineers replacing individual condensers floor-by-floor tend to keep 1.5-ton units in the highest rotation because that is what the majority of apartments actually need. Use our through-wall sizing guide if you want to verify capacity against sun exposure and floor height for your specific unit.

The cabinet is water-resistant for exterior facade mounting, service valves are brass, and warranty terms include 5 years on the compressor and 2 years on parts. The unit ships tested and ready for straight installation, nothing about the spec differs from the Aerosys or AboveAir equivalent that likely came out of the sleeve. NYC approved for the standard 36" x 19" opening, so this qualifies as a simple equipment replacement rather than an HVAC modification.

We keep this unit stocked as a reliable fallback when Aerosys or AboveAir 1.5-ton inventory is out, which is the norm during NYC’s busy replacement season. For multi-unit orders or compatibility checks with an existing indoor air handler, call us at (385) 319-1559.