Add heat to discharge by solar is doing exactly this!

Operation of an air conditioner at elevated ambient temperatures inherently results in a lowercoefficient of performance (COP). This conclusion comes directly from examining the Carnotcycle. The COP relation, COP=Tevap/(Tcond-Tevap), indicates that the COP decreases when thecondenser temperature increases at a constant evaporation temperature. This theoreticalindication derived from the reversible cycle is valid for all refrigerants. For refrigerantsoperating in the vapor compression cycle, the COP degradation is greater than that for the Carnotcycle and varies among fluids. The two most influential fundamental thermodynamic propertiesaffecting this degradation are a refrigerant’s critical temperature and molar heat capacity. (e.g.,McLinden 1987, Domanski 1999). For a given application, a fluid with a lower critical temperaturewill tend to have a lower COP

http://fire.nist.gov/bfrlpubs/build02/PDF/b02186.pdf