Definition of Two-Stage If you have a two-stage heating system, your installation comes with a supplementary heating system to pump out hotter air in case the temperature of the room continues to decrease even after the main system fires up. This method works effectively in houses built in harshly cold environments. Two-stage heating systems come with two-stage thermostats that tell the system when to fire up the supplementary heating elements. Using a Two-Stage System Two-stage heating systems save you money because they use only the amount of heating power necessary to raise a zone's temperature to a target specified by the thermostat without unnecessarily bleeding out extra heat through the pump system. Only when temperatures continue dropping does the system call for the supplementary elements. In other words, a two-stage system calls for extra juice only when it needs it. Effects Just like a car reduces acceleration, heat pumps reduce power as they near their targets. Two-stage stepping heat pump systems apply a higher heating capacity that overcomes the heat loss within a building. If a space of 300 cubic feet loses four degrees in heat per hour, the heat pump must compensate by pumping in more heat than the space loses. As the temperature approaches the target, some heating elements must turn off to reach a temperature just above the target temperature, much like a car must decrease its rate of acceleration as it approaches a desired speed. Insulation To reduce the amount of times a two-stage heat pump initiates the second stage, you may reap the benefits of an interior or exterior insulation system. Installing both gives you extra protection against heat loss in your building. If you have an HVAC unit installed in your house, you should not only isolate your walls but also isolate your attic and basement to prevent heat loss from above and below the house -- where it happens most frequently.
All right now Old Poppy