Heat Pumps
Buildings and Cities
Heat pumps transfer heat from a cold space to a hot one. Highly efficient, they can dramatically lower building energy use for heating and cooling.
Rank and results by 2050 #42
Heat Pumps
| Reduced CO2: | 5 gigatons |
|---|---|
| Net cost (Billions US$): | $118.71 |
| Net operational savings: | $1,546.66 billion |
TOTAL CO2-EQ REDUCTION (GT)
Total CO2-equivalent reduction in atmospheric greenhouse gases by 2050 (gigatons)
NET COST (billions US $)
Net cost to implement
SAVINGS (billions US $)
Net savings by 2050
Impact:
Heating and cooling of residential and commercial building space requires more than 13,000 terawatt-hours of energy and is estimated to increase to more than 18,000 terawatt-hours by 2050. This energy use comes from on-site fuel combustion and electricity-based systems — from gas furnaces to air-conditioning units. High-efficiency heat pumps reduce fuel consumption to zero and use less electricity to generate heating and cooling. Current adoption is low at .02 percent of the market, but we estimate rapid growth as costs continue to decrease by up to 25 percent by 2050. For a cost of $119 billion in addition what would be spent on conventional technologies, operating savings could reach $1.5 trillion over three decades and $3.5 trillion over the technology’s lifetime. Emissions reductions in this scenario come to 5.2 gigatons of carbon dioxide.
Heat Pumps
Buildings and Cities
Heat pumps transfer heat from a cold space to a hot one. Highly efficient, they can dramatically lower building energy use for heating and cooling.
The building sector worldwide uses approximately 32 percent of all energy generated; more than one-third of that is for heating and cooling. Maximum efficiency in heating and cooling could cut energy use by 30 to 40 percent.
The means to increase efficiency are at hand, and one technology stands out from the rest: heat pumps. Like a refrigerator, a heat pump has a compressor, condenser, expansion valve, and evaporator, and transfers heat from a cold space to a hot one. In winter, that means pulling heat from outside and sending it into a building. In summer, heat is pulled from inside and sent out. The source or sink of heat can be the ground, air, or water.
While cost can be high and efficiency fluctuates depending on local climate, heat pumps are easy to adopt, well understood, and already in use around the world. They can supply indoor heating, cooling, and hot water—all from one integrated unit. When paired with renewable energy sources and building structures designed for efficiency, heat pumps could eliminate almost all emissions from heating and cooling.
