Heat pumps: what they do and why they’re hot now | The Verge
Your questions, answered.| The Verge
A heat pump might be your best option for efficient heating and cooling.| Energy.gov
Geothermal heat pumps are expensive to install but pay for themselves over time in reduced heating and cooling costs.| Energy.gov
World Energy Balances: Overview - Analysis and key findings. A report by the International Energy Agency.| IEA
