Use and Care Guide

Use the map above to determine your region and compare to the chart below to find your application size.
80% AFUE KG7SA Series Gas Furnace (Upflow/Horizontal) Selection
Region 1 Region 2 Region 3 Region 4 Region 5
705-880 760-950 850-1060 1035-1285 1160-1440
880-1055 950-1140 1060-1270 1285-1545 1440-1730
1055-1405 1140-1515 1270-1695 1545-2060 1730-2305
1405-1755 1515-1895 1695-2120 2060-2570 2305-2880
1755-2105 1895-2275 2120-2540 2570-3085 2880-3455
2105-2460 2275-2655 2540-2965 3085-3600 3455-4035
Residential Sizing: The table and charts are intended to be used as a guideline for Residential applications only.
The information is based on conventional window space (<15%), insulation and building construction (8 ft.
ceiling height). When including a finished basement, use 1/2 of the finished basement square footage with
the rest of the area being calculated.
Mobile/Manufactured Home Sizing: Refer to the Date Plate located in the electrical box or kitchen cabinets. For
further assistance, call Hamilton's customer service department [phone].
120,000 BTU
Square Footage
Equipment Sizing Guide
Furnace BTU Input Size
45,000 BTU
54,000 BTU
72,000 BTU
90,000 BTU
108,000 BTU