HVAC/Rooftop Units

Two small rooftop units on sleeper supports.

A curb-mounted HVAC unit on a TPO roof.

More Pictures:

1. Rooftop Curb Adapter Pictures

Useful Links:

1. General: "Heating, Ventilating, and Cooling Historic Buildings - Problems and Recommended Approaches" is a great article and also worth reading as a general introduction to HVAC systems.  The article is from 1991 and available on the US National Park Service's Technical Preservation Services website.

2. Technical: "Guidelines for Roof Mounted Outdoor Air-Conditioner Installations" is available on the website of the Air-Conditioning, Heating, and Refrigeration Institute.

3. Technical"Attachment of Rooftop Equipment in High-Wind Regions" is an informative little introductory article available at the FEMA website.