Zoneaire PTAC Replacement: The C and S Series and Every Brand Name They Wore
Zoneaire was a division of Inter City Products, now International Comfort Products, until 1994, when it was sold to Friedrich. It built three PTAC models in the US and one in Canada, and sold hundreds of thousands of units under several brand names. Applied Comfort in Canada acquired the rights to the C and S lines, which is why replacements for them are still built.
The C Series (CSM, CHP)
Sold under brand names including Climette, KeepRite DM, Carrier Wallmate, Whirlpool AVT, and McQuay TPW.
- 32" wide by 18" high
- Two sleeve depths: 14.25" and 16.25", the more common
- Mostly 208/230V and 265/277V. A few 115V units were built for cooling only or hot water and steam heat.
- 9,000 to 15,000 BTU cooling, electric heat on 15, 20, or 30 amp circuits
Today's replacement is the Applied Comfort DM Series, which fits the 32" x 18-5/16" opening. See replacing PTACs on the 32-inch sleeve.
The S Series (SC, RM, SEA, SHA)
Made mainly for the US market, and sold as CoolHeat, Embassy Weather Twin, Sears Kenmore, TPI, and Zoneaire.
- 208/230V, 265/277V, and 115V. The 115V units were for hot water or steam heat.
- Cooling only, cooling with electric heat, and heat pump versions
- 9,000 to 15,000 BTU cooling, heat on 15, 20, or 30 amp circuits
Today's replacement is the Applied Comfort SC, a 36-inch unit with left-hand controls. It also replaces Retroaire RC/RH20, Islandaire RM, Zoneaire New York RM, TPI Ramatic, and Sears 867 units.
Identifying your unit
The brand on the front cover is often not the maker. Measure the sleeve and read the nameplate:
- About 32" x 18": C Series, replaced by the DM Series
- About 36" wide: likely S Series, replaced by the SC
More detail on the Zoneaire PTAC replacements page.
Send the model and serial number through the contact form or call 800-866-1210.