They come from some of the best-known names in heaters and range in size from portable 3,800 British thermal units (BTU ... heater may need more than 40,000 BTUs to keep an open-air space warm.

They aim to improve the efficiency of residential air source heat pumps; heat pump water heaters, and commercial building ventilation. Other projects research insulation and thermal storage, inform ...

Walmart has the Ozark Trail 4,200 BTU Portable Propane Heater for a low $20.97. Free Shipping on orders over $35 or buy online, pick up in store. This is normally $49, so you save 57% off.

Learn more If you like to enjoy your patio furniture or fire pit year-round, the right outdoor patio heater can ... thermal units (Btu) of heat that covers the surrounding air like a warm blanket.

This site displays a prototype of a “Web 2.0” version of the daily Federal Register. It is not an official legal edition of the Federal Register, and does not replace the official print version or the ...

This site displays a prototype of a “Web 2.0” version of the daily Federal Register. It is not an official legal edition of the Federal Register, and does not replace the official print version or the ...

HIGH-QUALITY MATERIAL - AC cover is made of 600D oxford fabric with waterproof PVC coating which is durable and can protect your air conditioner from damage for rain, snow. PROFESSIONAL DESIGN ...