Excel Air manufactures do-it-yourself air-cooled air conditioning systems. Most of their products can be installed without the need for an HVAC contractor, due to their patented plug-and-play fittings. Excel Air was the first company in our industry to offer this technology, which has made a huge difference to thousands of indoor growers. Without Excel Air and their customized fittings, many growers would never have gotten off the ground. Excel Air offers two lines of air conditioning systems - the XL series and the Stealth series. The Stealth series moves the noisy compressor out of the condensing unit and into its own sound-proof box, perfect for installations with nosy neighbors. In addition, they also offer dual-damper control packages, enabling the grower to cool two rooms with one Excel Air unit. For smaller grow rooms they also offer a compact (mini-split) unit. Several add-ons are available for most models, including odor elimination, heating and many of the accessories one might need to complete their own custom installation.