About loadcalc a load calculation program based on manual j designed to be quick and easy to use it calculates the amount of heating and cooling btus needed for the whole house block load or a room by room load. Load calculationa systematic method of evaluation to estimate heat loss sensible and latent heat gain an account of the total heat flow into or out of a home depending on the time of year we need to do load calculations in order choose equipment that will make an occupant comfortable and safe and to keep energy costs down. The manual j residential calculation is actually the proper method for sizing an hvac unit a technique designed by the air conditioning contractors of america acca this calculation is commonly performed with complex computer programs which require time energy and money. The manual j load calculation is a systematic method of evaluation to estimate heat loss sensible and latent heat gain an account of the total heat flow into or out of a home depending on time of year the calculation covers the entire building each floor of the building and each room in the building
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