The acronym SEER stands for "seasonal energy efficiency ratio." A heating or cooling unit is assigned a SEER rating to indicate the efficiency of the unit. Heat pumps with higher SEER ratings operate under increased efficiencies. The 4SHP14LE and 2HP14 offer a 14 SEER rating. The 4SHP13LE and 2HP13 offer 13 SEER ratings.
Depending on the model, 4SHP14LEheat pumps are up to 35.75 by 37.75 inches wide and 43.75 inches tall. 4SHP13LE models are up to 29-3/8 by 31.25 inches wide and 43.75 inches tall. 2HP14 models are 30 by 30 inches wide and up to 41.75 inches tall. 2HP13 models are designed to the same dimensions as 2HP14 models.
British thermal units per hour (BTUH or BTU) is a measurement of the amount of heat energy a unit can produce in one hour. Models in the 2HP13 series offer between 11,900 and 58,900 BTUs. Models in the 2HP14 series offer between 14,400 and 57,700 BTUs. 4SHP13LE models produce between 10,600 and 57,000 BTUs. Models in the 4SHP14LE series produce between 9.500 and 54,000 BTUs.