New construction is simple compared to an addition or remodel project. The
insulation values are usually consistent in a new Building and Houses, but in an
older Building and home, it may vary from room to room. It is not sufficient to
merely supply the additional room(s) with the calculated amount of heat, as it may
throw the existing rooms out of balance. Sometimes it is necessary to supply the
new room with an incorrect amount to keep it proportional to the rest of the house.
In severe situations, the newer area may need to be heated as a separate zone.In
any case, a heat loss/gain should be performed on the existing rooms as well, and
the existing system should be evaluated to determine how well it conforms to the
calculated requirements. A new heat loss will also tell you if the existing heating
system can accommodate the additional load requirements of the addition.

Also keep in mind that the rooms adjacent to the addition have lost exposure to
the outside and will need less heat.

These same conditions also apply to remodeling projects, where the addition or
removal of windows can seriously affect the room's heating needs as will adding
doors or raising ceilings.
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5124 Ave N. Brooklyn N.Y 11234 Tel:718-253-6600