As of February 2015, there are a few Heil A/C units for sale on eBay. In general, though, Heil does not sell its air conditioners online; it sells them directly to wholesalers and A/C contractors. End users can usually only buy them from contractors.
The simplest way to buy a Heil air conditioning unit is to contact a local firm that sells and installs them. Users can go to Heil's website and choose the "Dealer Locator" tab before entering the appropriate zip code into the form to view a list of contractors in the area.
In terms of online presence, as of January 2015, a wide array of new and used parts for Heil A/C units are available on eBay, along with a few complete units. Amazon also sells a variety of both new and used parts. AC Doctor.com, on the other hand, lists specifications for a number of Heil A/C units. For each unit, it provides a button to click on to find a contractor in the local area who stocks that Heil unit; another button reveals any rebates available from Heil. Reviews of Heil A/C units are available at Furnace Compare.com to help consumers choose the right units for their needs