No underfloor insulation, if not on a concrete pad.Walls and ceiling partially, poorly or not insulated.Typical heat loss in a Perth home, summer and winter When you would use between 125W/m 2 -145W/m 2 to size your air conditioner Not many lights or electrical appliances running during the day.House fully sealed and free of draughts.Super efficient insulation or build materials.Home predominantly used for heating (as the heating output is higher than the cooling output).Window panes designed to reduce the heat loss or gain.Your windows have little or no direct spring or summer sunlight and low levels of diffused light.Use fans to boost the cooling and heating effect of your air conditioning. ![]() ![]() When your home would be sized at 125W/m 2 and you have several other factors reducing the load on your air conditioner: When you would use less than 125W/m 2 to size your air conditioner:
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