General FAQs Q: Can RetroAire supply PTACs other than those in selection guide? A: RetroAire will be more than happy to look at producing replacement PTACs/PTHPs that may not be in our listing. If there are sufficent quantities to warrant the devlopement of the product. Contact our sales department to discuss your replacement requirements. Q: What information is needed to identify a replacement for an older model PTAC/PTHP? A: The dimensions of the old chassis, length, width and height; model model number, voltage, amps, control box location, and capacity of the unit to be replaced need tobe identified to insure the correct replacement is selected. Q: What is a retrofit PTAC/PTHP? A: A retrofit PTAC/PTHP is a replacement of an older model PTAC/PTHP using the existing wall box and replacing the chassis, resulting in only minor installation costs. Q: What types of products does RetroAire manufacture in Rome, NY? A: RetroAire manufactures replacement PTAC/PTHP chassis for almost any non 16 x 42 unit, found in a wide varietyof properties. RetroAire also produces water source console units. The V-Pac vertical stack PTAC/PTHP is used for both new construction and replacement applications.