Guide collection

Air conditioner buying guides

Understand BTU capacity, room heat gains, running cost and exhaust requirements before choosing portable air conditioning.

What size air conditioner do I need?

Calculate capacity from room volume, glazing, sunlight, occupants and equipment.

Compare common portable-AC classes without relying on room area alone.

Balance capacity, sleeping noise, placement and the window exhaust.

Separate cooling output from input watts and calculate electricity cost.

Compare active room cooling with lower-cost personal airflow.

Understand refrigeration, evaporation and indoor-humidity trade-offs.

Check window type, sealing, hose length and placement before buying.

Answer the focused quiz and compare products matched to your needs.