HVAC system

Heating and cooling

Conditions and needs vary greatly, but internal temperature control can account for around 40% or more of energy used in buildings, from homes to office blocks.

Several technologies for heating and cooling exist, including air conditioners, electric space heaters, wood-burners and ducted gas heating.

Renewables such as solar and wind (with breakthroughs in conversion and storage) are increasingly being accessed as energy sources.

Good management of appliance use, and minimising heat loss or gain through gaps and windows, can bring substantial savings.

Ways to save

Install the most energy-efficient appliances   

Invest in the latest, most energy-efficient appliances available. Use a comparative calculator or app to work out your most cost-effective options.

Minimise use of appliances

Heat or cool rooms only when they’re in use, and take maximum advantage of natural warmth, cool air and breezes. Use thermostats or HVAC management software to schedule and control the operation of appliances.

Optimise building layout and insulation

Passive’ design refers to orientating and constructing a building to take advantage of, or minimise, local climate and environmental conditions, such as sun, breezes and shading. Insulation is essential in all climates, and in many cases can be improved in established properties.


Energy rating

US Department of Energy