The USB-4232 is bi-directional which means it will not only convert from USB to 4 port RS232 but 4 port RS232 to USB. These USB to 4 Port RS232 converters feature (4) 9-pin DB9s for simple cable installation. Our converters are protected by a 5 year warranty and 30 day money back guarantee.
While variable speed air source heat pumps can be competitive with geothermal heat pumps in retrofit situations and smaller, better insulated buildings and less extreme climates, GHPs remain the most efficient way to heat and cool a building.
Energy-Efficient Furnaces and Boilers. After youâve retrofitted your home for energy efficiency, itâs time to sort through your green heating options. One simple way to have a cleaner home heating system is to install a super-efficient boiler, gas furnace or oil furnace to replace your existing heater.