Heatsavr™ is an effective “liquid pool blanket” for swimming pools and spas. Heatsavr™ greatly reduces heat loss and evaporation from the exposed pool surface 24 hours per day. The product is a patented, non-toxic, biodegradable and completely safe liquid that does not change the appearance or operation of the pool. In addition to savings on water heating, Heatsavr™ also reduces the overall energy usage which includes dehumidification and air heating. Reduced evaporation means less load on any dehumidification plant and when the pool is unoccupied the air temperature can be reduced to a set back level, resulting in reduced air heating costs.