Each heating plan should show the following information:

• Title of plan
• Scale
• Use of rooms and spaces
• Overall dimensions
• Extent of new construction including new work within the existing
• Capacity and location of electric heating facilities (when used)
• Make, Model, capacity and location of existing and/or proposed furnace
• Location and size of existing ductwork if new ductwork is connected
• Location and size of new ductwork and warm air outlets

Example of HVAC Basement Drawings.

Example of HVAC Ground Floor Drawings.

Each heating system floor plan is a floor plan of the structure, as described previously, showing the type of heating system and associated ductwork (for forced air systems) being used to maintain indoor temperatures at an acceptable level in winter. A heat loss calculation must be provided showing the amount of heat necessary to maintain 72o F (22o C) inside the addition at the outside winter design temperature.

When the existing warm air heating system is used to heat the addition, then a "whole house" heat loss calculation will be required. When new ductwork is proposed, duct design calculations are mandatory. In new homes and large additions, the mechanical ventilation system must be also known in order that Code compliance will be achieved. This information is normally prepared by heating contractors who are familiar with municipal conditions.

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