William Tao & Associates, Inc. (WTA) is a multi-discipline engineering firm providing innovative services in engineering and energy-effective building systems. WTA provides a wide range of engineering services including mechanical, electrical, plumbing, fire protection, building automation, structural, civil, master planning, and commissioning

Wolfe Innovations prides itself in being the best overall in HVAC customer service, low competitive prices, and trustworthiness.

Zamil Air Conditioners designs, manufactures, tests, markets and services a comprehensive range of air conditioning products, from compact room air conditioners and mini splits to large scale central air conditioners, chillers and air handling units for highly specialized commercial and industrial applications.

Zimmer's Heating & Cooling business has expanded to include residential, retail, and commercial heating and cooling.