From beginning to end our qualified employees will help you find the perfect fit for cooling and/or heating your home or office. What size do you need? Air conditioners are measured in tons, which refers to the amount of heat they can remove from your home in one hour. Depending on the size of your home and/or the space you wish to cool, determines the size you will need. A one-ton unit, on average, will remove 12,000 BTUs (British Thermal Units). A 4 ton air conditioner will remove approximately 48,000 BTUs of heat per hour from the house.