At ambient pressure and temperature the isobaric specific heat, CP, of ammonia is 2.2 [kJ/kg K] or 0.52 [Btu/lb °F] = [cal/g K], while the isochoric specific heat, CV, is 1.6 [kJ/kg K] or 0.39 [Btu/lb °F] = [cal/g K].
The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation.