Variable Air Volume Systems - Variable Air Volume (VAV) systems are the best way to zone especially in large buildings. A VAV system with the proper controls and setup will help the building owner realize large savings in energy usage. There are many VAV systems out there set up in different ways. The most common set-up (for DDC) is, of course, usually the cheapest to install.
They have an air handler (DX or Chilled Water) which supplies the VAV Boxes with fixed pressure and temperature of the conditioned air. The VAV Boxes have electric reheat which will heat the air if that particular zone calls for heat (it is not uncommon to also find VAV boxes that have hot water reheat although this usually costs more to install but can save in energy costs). More on how VAV boxes work.
Geothermal heat pumps use groundwater or water circulated through pipes to exchange heat with the earth. Geothermal versus air-source heat pump systems use the earth’s natural temperature to exchange heat and provide heating and cooling. The temperature of the air varies widely with the weather. Whereas the temperature of the earth is nearly constant.
This makes the use of a geothermal system ideal for heating and cooling. It also costs less in energy use because of the constant earth temperature versus the widely varying temperature of the outside air. Consequently, geothermal systems make sense and can save lots of money in energy use.
In HVAC a variable speed drive is a speed control system for electric motors. The variable speed drive (VSD) or variable frequency drive (VFD), among other names (adjustable-frequency drives (AFD), AC drives, micro-drives, or inverter drives). The application of variable speed drives has brought about a new way of engineering buildings and control systems HVAC.
The flow of water and air can now be regulated precisely using VSD’s and state-of-the-art control systems. By combining VSD’s with state-of-the-art control systems, large savings in energy usage can see realization because the exact quantity of flow of water or air can be delivered to satisfy demand.
Demand-based control is energy efficient. VSD’s can be stand-alone or controlled by a building automation system.
HVAC Manufacturers | Heating and Cooling - Heating and Cooling Manufacturers are always improving the energy efficiency of their products using innovation and modern technology to help. HVAC manufacturers are required by the government to increase the efficiency ratings of equipment sold. Usually, this is a mandate passed down by Congress that will set a standard for a minimum efficiency of air conditioners and heating systems. Usually, this mandate is the result of manufacturers, the department of energy, and other industry concerns meeting and agreeing to a new minimum that is more efficient and utilizes less energy than previous models and designs. (more…)
HVAC Tip - Having the proper humidity levels in your home or business is important not only for your health but also the amount of energy your HVAC systems use to keep you comfortable. If the humidity level is high in the summer you will not feel comfortable. If the humidity level is low in the winter you will not feel warm when the thermostat is set for an average temperature. This will result in turning the thermostat up to compensate and you will use more energy to stay comfortable. A properly designed and installed HVAC system will keep the proper levels of humidity in your home or business and save you money in energy costs by reducing the amount you use the HVAC system. For more information on humidity and maintaining the proper levels of humidity in your home please visit our humidity technical pages.
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In HVAC a variable speed drive is a speed control system for electric motors. The variable speed drive (VSD) or 
HVAC Manufacturers | Heating and Cooling - Heating and Cooling Manufacturers are always improving the energy efficiency of their products using innovation and modern technology to help. HVAC manufacturers are required by the government to increase the efficiency ratings of equipment sold. Usually, this is a mandate passed down by Congress that will set a standard for a minimum efficiency of air conditioners and heating systems. Usually, this mandate is the result of manufacturers, the department of energy, and other industry concerns meeting and agreeing to a new minimum that is more 