Calculators

Calculators

• What size dehumidifier do I need?

  Answer four questions about your home and get the dehumidifier size and type that suits it, with what it will cost to run.

• Appliance running cost calculator

  Find out what any electric appliance costs per hour, day, month and winter at the current UK price cap.

• Humidity and mould risk checker

  Enter your room temperature and humidity to see your mould risk and the temperature at which walls and windows start to get wet.

• Heating cost per hour: throw, heaters, gas, oil and heat pump compared

  Compare the hourly cost of a heated throw, electric blanket, plug-in heaters, and gas, oil, heat pump and electric central heating.

Home Comfort Cost Index

Updated every quarter when the price cap changes.

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  Home Comfort Cost Index, Q4 2026: what it costs to heat, dry and cool a home

  What it costs per hour, per evening and per month to heat, dry and cool a UK home at the Ofgem price cap for 1 October to 31 December 2026. Updated every quarter.

Running cost tables

• Dehumidifier running costs: popular models compared

  What each popular dehumidifier costs per hour and per month at the current price cap, from its rated power.

• Dehumidifier noise and capacity table

  Every model we list, with its extraction rate, tank size, noise level and power, in one sortable table.

• Heated airer running costs

  What heated clothes airers cost per hour and per load at the current price cap, and how that compares with a tumble dryer.

• Electric blanket and heated throw running costs

  What electric blankets and heated throws cost per hour, per month and per winter at the current price cap.

• Oil radiator vs fan heater vs halogen heater: running costs

  Which electric heater is cheapest to run, how thermostats change the answer, and which suits which room.