My states energy code requires an economizer. Does a hybrid water source heat pump system meet code?
Many states have energy codes that require economizers when temperatures drop to a specified temperature, such as 45 F. Most state codes have an exception for high-efficiency water source heat pumps. For example, the Oregon Energy Code specifies an exception for “systems that use heat recovery between interior and exterior zones.” The reasoning is that “an economizer would reduce the amount of time when the compressor would operate in cooling mode during cool outdoor conditions. This would reduce the effectiveness of heat recovery.” There may be other exceptionscheck your states code.
