What are the best Solar Air Heaters in 2019?
Here are the top picks from HvacRepairGuy!
These systems are made in Germany by GRAMMER SOLAR. They offer five sizes of systems to match the needs of the home. They provide ventilation at the same time as they use outdoor air instead of heating the indoor air. The systems can be purchased directly from the manufacturer and are backed by a very good warranty.
This brand is from ENVIRONMENTAL SOLAR SYSTEMS. They offer units that can be roof or wall-mounted and have an internal thermostat. They feature stainless steel hardware for durability and are backed by a decent guarantee.
These systems are made in China and can be roof or wall-mounted. Their website is not much help but the systems are backed by a decent warranty.