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HVAC System Design

You HVAC system will heat, ventilate, cool, humidify, dehumidify, or filter the air in your room. But it may also add the noise of rushing air, the creaking of hot water pipers, the rumbling of motors, compressors and burners. And even when off, it may provide a flanking path to defeat your soundproofing.

In a forced air system, conditioned air should enter the room slowly. A good design picks a happy medium between the quiet of slow moving air and the required volume of air movement for the temperature and ventilation requirements of the room.

In a low air speed HVAC system, cooling ducts can be placed in the ceiling or high on the walls so the the heavy cool air drifts down over the space naturally. And of course heating ducts on the floor or low on the walls will let warm light air drift up into the room. These duct placements eliminate the need for rushing air to be forced against the natural convection currents in the room.

To slow the air just before it enters the room, we can specify still air boxes in which rapidly entering air is dispersed and distributed more slowly through a number of ducts. A still air box can also help reduce noise transmission both in and out of the room.

If you are custom building a room, we may recommend that you consider radiant floor heating; it's very comfortable and quite quiet. Because the surface area of the floor is so large, a very low floor temperature such as 81 degrees Fahrenheit will evenly heat the room. In winter, radiant heat does not contribute to low humidity as does forced hot air. Also, because radiant heat eliminates the need for radiators and ducts, the acoustic layout of the room and optimal system setup need not consider these obstacles.

Radiant floor heating may actually reduce energy costs too. Some of the heat radiated by the floor directly warms you without warming the air in the room first. The reduces your body's heat loss. Therefore the room may feel warm even though the actual air temperature may be cooler.

There are a couple of disadvantages to radiant heat. When you return from an extended vacation, the radiant heating system will need more time to warm the room because of the larger thermal mass involved. Also, care must be taken during construction and any subsequent renovations to protect the heating tubes in the floor from punctures.

You may also wish to consider radiant cooling, particularly if you live in a dry climate. When conventional air conditioning system cools hot, moist air, the excess water condenses and drips into a drain. With radiant cooling, the moisture will remain in the air, and may leave the room feeling somewhat clammy. In dry climates this isn't a problem because the air contain no excess of moisture.

If you are considering a radiant system, we suggest that you contact an experienced HVAC contractor and visit one of their installations to see how you like it.

Each HVAC project is different. Lifestyle issues, performance issues, budget, and personal preferences mandate a customized approach to each individual job.

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