Installing the hvac system for a multi-million dollar custom home here was a real challenge for Marshall Dennington, owner of Temco Air Environmental.

School districts are requesting an almost overwhelming amount of renovation and repair work for their buildings, and hvac contractors are struggling to keep up with the demand.

Chas. Roberts is one of the largest hvac contractors in Arizona.

Business is great in all market segments in Phoenix, and most hvac contractors seem to be doing well, including W.D. Manor Mechanical, a mechanical contracting firm.

In some cases, contractors are using zoning rather than adding an extra system.

Sam DiCicco not only owns several office buildings in the area, he’s also the proprietor of a successful commercial and institutional contracting business.

In essence, zoning divides a home into areas with similar heating and cooling requirements, and each area has its own thermostat.

Costs have come down to where just about any application can use sensors to help save energy, as well as gain better control of air quality and comfort.

In spite of all the positive uses of mercury, there is a growing concern about the repercussions.

Sensor technology has come a long way in the last few years.