The Heat Controller GLDH is the same series as the Heat Controller GLUA furnace. The GLDH series are the downflow or horizontal models. These models can be used in tight spaces in a horizontal manner which provides more options for installation. The Heat Controller GLDH earns a ninety percent AFUE rating for fuel efficiency. Heat Controller claims it’s closer to ninety-two percent.
Heat Controller has two divisions in the United States market: Comfort-Aire and Century. The horizontal GLDH line can be found with the brand names of both companies. The products appear to be the same in a side-by-side comparison.
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Other GLDH Reviews
Most of the online conversation related to Heat Controller GLDH revolves around installation.
A user on diychatroom.com asks for opinions about Heat Controller/ComfortAire furnaces. Contractors respond differently; one says taking care when choosing an installer is more important than the product itself. Several other posters however recommend other brands. One writer asks a question about improper air circulation.
A post on hvac-talk.com reveals that a horizontal GLDH was not installed properly. The contractors online direct the questioner to download the installation instructions and start over with what is an attic installation.