Parts for an Armstrong gas furnace can be found online on Supply House, Midwest HVAC Parts and Dey Parts. Each website lists a variety of available parts for purchase, as of 2015.
Supply House categorizes available parts into sections including transformers, gas valves, venting and miscellaneous. A customer can click on a category to view which parts are in stock and detailed information about the product.
Midwest HVAC Parts lists Armstrong replacement parts including ignitors, control boards and gas valves. A customer can click on a part to view an image, details and technical tips.
Dey Parts sells furnace parts for various Armstrong models. A customer can click to view the price and technical detials of the part.