**Nomenclature**

LPG Liquified petroleum gas CB Condensing boiler HP Compressor heat pump COP Coefficient of performance of heat pump AH Oil fired air heater OAT Outside air temperature IAT Inside air temperature ESD Experimental starting date ECD Experimental completion date DAT Days after transplant BS Basal heating section AS Air heating section EUE Energy-use efficiency SREUE Source-related energy-use efficiencies


RE Renewable energy
