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Building envelope design is a specialized area of engineering and architectural design that centers on indoor climate control. A building envelope includes all the elements of the outer shell of a building that separates the conditioned (indoor) environment from the unconditioned (outdoor).
Heat pumps transfer heat from a source to what is known as a heat sink. Heat naturally flows from warmer spaces to cooler places. However, a heat pump can make that flow work in reverse, too. Air conditioners and freezers are familiar examples of heat pumps in action; the term “heat pump” covers a broad range of devices in general and can be applied to many HVAC components used for cooling and heating. These devices are also often used with hot water heaters in domestic applications.
Most new homes today have HVAC systems that are too large for the structures they serve. In order to correctly determine HVAC load calculations, time and attention to detail are required. Many contractors rely on rules of thumb to determine the sizes of the systems they install; it’s usually based on the square footage of the conditioned floor area. They often use 400 to 600 square feet per ton as the rule.
Every house is unique. Consider this: The same house rotated 90 degrees could result in a different cooling load by 25% or more!
Room by Room Airflow
Room air distribution defines the way air is introduced to, flows through, and is removed from areas. It can usually be defined as one of two types: dilution (or mixing) and displacement.
Dilution (Mixing) Systems
These systems blend supplied air with room air to produce air at the desired temperature and humidity. In cooling mode, cool supplied air is usually about 55 degrees F and exits an outlet at high velocity, caused by diffusers. The high velocity causes turbulence, causing room air to mix with supply air. Since the entire room is almost fully mixed, variations in temperature are small. Usually, air outlets and inlets are located in the ceiling.
Insulation represents the first line of defense for your home against unwanted hot and cold air infiltration. Adding insulation is an effective way to increase your home’s energy efficiency. This not only includes adding insulation to your attic, but also sealing air leaks around electrical boxes, door frames, recessed lights, plumbing, and more. Air leaks can account for up to 30% of a home’s energy loss. When it comes to adding insulation to the attic, the way to go today is to blow in loose-fill insulation.
Why Check Static Pressure?
Checking the static pressure of a residential HVAC system is crucial; since the entire point of a system is to move air (warm or cool) around a home, measuring the pressure gives an indication of how well the system is performing.
Did you know that many home performance issues can be detected by infrared technology? An infrared camera can diagnose problems like missing insulation, thermal bridges, moisture intrusion, and air leaks. The technology has been used for more than 40 years – and is a valuable diagnostic tool because it doesn’t require damaging any walls, ceilings, or other structures of the home.
During a home energy audit, one of the tests that may be performed is a blower door test. This survey determines the degree to which a home is airtight. Why should homeowners establish good air tightness for their homes?
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Awards & Certificates
- Better Business Bureau Honor Roll Member for 21 Years Running
- BPI Certified
- Energy Upgrade Participating Contractor
- Trane Award for Superior Installation and Service
- Voted Best Heating/Cooling Company for 12 years by Readers of The Vallejo Times Herald
- Vallejo Schools V.I.P. Award for Partners in Education
- Vallejo Little League for Support and Generosity
- Bay Area Certified Green Business
- Employee Support of the Guard & Reserve by Office of the Secretary of Defense
- Energy Efficiency Award by Energy Upgrade California
- Chambers of Commerce: State of California, City of Vallejo, and City of American Canyon
- League of California Homeowners
- Electric & Gas Industries Association
- Air Conditioning Contractors of America
- Napa-Solano Builders Exchange
- Better Business Bureau
- Safety Services Company
- NATE Certified
- EGIA Approved Contractor
- Diamond Certified
- A-1 Guaranteed Heating & Air Conditioning
1768 Broadway St. Vallejo, CA 94589