Sizing Charts for Air Conditioners and Heat Pumps

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PREMIUM INSULATION    (2X6  WALLS)
R19 WALL   R38 CEILING   R22 FLOOR   DOUBLE PANE WINDOWS

HIGH SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ'
TEMP 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500
90 2 2 2 2 2 2 2 ½ 2 ½ 2 ½ 2 ½ 3 3 3 3 3 3 ½
95 2 2 2 2 2 2 ½ 2 ½ 2 ½ 3 3 3 3 ½ 3 ½ 3 ½ 3 ½ 4
100 2 2 2 2 ½ 2 ½ 2 ½ 2 ½ 3 3 3 3 ½ 3 ½ 3 ½ 3 ½ 4 4
105 2 ½ 2 ½ 2 ½ 2 ½ 3 3 3 3 ½ 3 ½ 3 ½ 4 4 4 4 4 5
110 2 ½ 3 3 3 3 3 ½ 3 ½ 4 4 4 5 5 5 5 5 5

 

STANDARD INSULATION      (2X4 WALLS)
R13 WALL   R30 CEILING   R11 FLOOR   DOUBLE PANE WINDOWS

HIGH SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ' SQ'
TEMP 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500
90 2 2 2 2 2 2 ½ 2 ½ 2 ½ 2 ½ 3 3 3 3 3 ½ 3 ½ 4
95 2 2 2 2 ½ 2 ½ 2 ½ 2 ½ 2 ½ 3 3 3 3 ½ 3 ½ 3 ½ 4 4
100 2 2 ½ 2 ½ 2 ½ 2 ½ 2 ½ 3 3 3 3 3 ½ 3 ½ 3 ½ 4 4 5
105 2 ½ 2 ½ 2 ½ 3 3 3 3 ½ 3 ½ 3 ½ 4 4 4 5 5 5 5
110 3 3 3 3 ½ 3 ½ 3 ½ 4 4 4 5 5 5 5 5 5 5

 

Sizing air conditioning and heat pumps is an exact science based on inexact information. Each home is an individual calculation. Two identical homes placed side by side may have different heating and cooling characteristics due to the lifestyles of the occupants. Therefore, we usually generalize and attempt to find a workable average. The high temperature shown here is not the highest for the year, but usually a figure about 5 degrees lower than the maximum temperature. The numbers 2- 2 ½ -3 -3½ -4 -5 represent tons of air conditioning required for either an air conditioning unit or heat pump.