Calculate tonnage of heating and cooling equipment needed based on square footage of homes, such as 1 ton for every 1,000 square feet. Find the overall tonnage by factoring several criteria such as number of windows, people in the house, thermal properties of appliances and overall heat gain of the dwelling.Continue Reading
Know the general rule of thumb for newer homes in the United States, which is 1 ton of equipment for every 1,000 square feet of living space. Realize that energy-efficient homes may only need 1 ton for every 2,000 square feet.
Calculate variables that add heat to a home. A human body averages 230 BTUs per hour. The total amount of appliances account for 1,600 BTUs in an hour, and lighting adds another 1,600 BTUH. Houses with more efficient appliances, fewer windows and better lighting do not have as much inside heat. Denote that heating and cooling zones mean different needs based on local climates. Square footage needs for HVAC equipment differs from warmer climates to cooler climates in the United States.
Get assistance from computer programs that help by automating the process. Find programs that follow the "Manual J" method adopted by the Air Conditioning Contractors of America. When calculations are done correctly, the computer program determines a smaller air conditioner is needed than what is normally calculated using a rule of thumb.
HVAC schematics are diagrams describing the detailed functionality of a system. They consist of wiring diagrams for the electrical system and plumbing diagrams for air flow and refrigerant lines. Schematics use various types of symbols, lines and annotations.Full Answer >
The most common programmable HVAC wiring systems in homes contains a furnace and an air conditioning unit. In this case, the thermostat wires are color-coded. Typically, common household thermostats only contain five terminals: two for red, one for green, one for yellow and one for white.Full Answer >
A 12-volt electrical system operates on 12-volt current rather than the more typical 120-125 volts located in most homes and businesses. A 12-volt electrical system is common in recreational vehicles, camping trailers, cars and trucks. Those with solar power systems often use 12-volt systems.Full Answer >
Circuit breakers produced by Federal Pacific Electric, particularly the Stab-Lok circuit breaker installed in homes built before 1990, may cause fires, as reported by NBC. Despite the fire risk, the company has never recalled these circuit breakers.Full Answer >