Home Heating Calculations

Housing units = 145,344,636

Percentage of households using fossil fuels = 52%

Number of households to convert = 5.2 e-1 x 1.5 e8 = 7.5 e7 = 75 million

Single Family Houses (SFH)

Percentage of single family homes = 85/133 = 64%

Number of SFH to convert = 6.4 e-1 x 7.5 e7 = 48 million

Conversion cost, In Seattle, in 2024, for a 1400 sq. ft. house that has forced air heating:

Upgraded electric service = $15,000

Heavy duty heat pump that will deliver full output down to an outdoor temperature of 5 degrees F, = $15,000

In colder areas, additional resistive heating is needed, add $10,000 [est], in warmer areas, a less expensive heat pump would work, deduct $3,000 [est] Overall adjustment = $7,000

Average single family house (SFH) size = 2,273

Cost to convert an average SFH with forced air heating = 1.5 e4 + (2.3 e4 / 1.4 e4) x $2.3 e4 = $51,000

Percentage of SFH with forced air heating = 75%

Number of SFH with forced air heating = 7.5 e-1 x 4.8 e7 = 36 million

Cost to convert all SFH with forced air heating = $5.1 e4 x3.4.8 e7

= $1.8 trillion

Conversion of a SFH without forced air heating would require 3 space heaters at [est.] $7,000. The cost would be $5.1 e4 + (3 x $7 e3) = $72,000′

Number of SFH w/o forced air heating = 2.5 e-1 x 4.8e7 = 2.5 e-1 x 4.8 e7 = 1.2 e7 =12 million

Cost to convert all SFH w/o forced air would be 1.2 e7 * $7.2 e4 = $860 billion

Multiple Units

Percentage of housing units that are single family houses = “85 million out of the total 133 million” = 85/133 = 64%

Number of multiple units that need to be converted

= (1 – .64) x number of units to convert = (1 – .64) x 75 million = 27 million

average size of unit = 900 sq ft

Cost of (shared) heat pump = (900/2300) x