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.
You have two main options: 80% and 95% efficient. Efficiency refers to the percent of fuel that is actually being used to heat your home. A 95% unit will have less fuel cost because 95% of the natural gas burned will be used to heat your home. In cold weather climates it is always a better choice to buy the most efficient unit you can afford.