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The THERMWELL AC2H is a window air conditioner cover designed to protect installed window AC units during periods of non-use, typically through fall and winter months. Constructed from durable polyethylene, it blocks water, ice, dust, and leaves from reaching the unit's coils, cabinet, and electrical components. At 18 inches long by 27 inches wide by 16 inches deep, it fits a range of standard window AC chassis sizes. HVAC service technicians and homeowners use this cover as a seasonal maintenance item to extend equipment life and reduce cleaning time at startup.
This cover is suited for residential and light commercial applications where window-mount air conditioners are installed and left in place over the off-season. It is installed from the exterior side of the window unit. The silver finish provides UV resistance and reflects solar heat during storage periods. Its rigid polyethylene shell holds shape under snow load and wind without requiring straps or fasteners in most standard installations.
Designed as an exterior seasonal cover for standard residential window-mount air conditioners. Fits units with a chassis profile within the 18 by 27 by 16 inch envelope.
This cover is installed by an HVAC technician or homeowner after the AC unit has been turned off and the system is confirmed to be non-operational for the season. Ensure the unit exterior is dry before placing the cover to prevent trapped moisture. The cover should be seated firmly against the wall or window frame to prevent wind displacement. Remove the cover fully before operating the air conditioner in the spring.
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