HVAC & Energy Guides

Practical guides that answer real search questions and link to free Thermopy calculators.

How to size an air conditioner correctly

Oversized AC wastes money and comfort. Learn how to estimate cooling load before you buy.

Compare upfront cost vs annual savings to see when a heat pump becomes the cheaper option.

Use consumption and tariff data to forecast monthly and annual heating bills.

Match radiator output to heat loss so every room reaches comfort without overspending.

See how loft, wall and window upgrades reduce heat loss and shorten heating bills.

Compare capital cost, SEER/EER and running cost for common commercial and large-home cooling options.