Larson Air, Las Vegas

Backed by a yearlong service warranty, Larson Air’s certified technicians flit through the city, responding swiftly to cure ailing heating and cooling appliances. They also preempt temperature-control emergencies with meticulous tune-ups, using a toolkit of 24 maintenance techniques to prepare systems for heat waves or the cold spells that occur when snowmen escape from the zoo. For homeowners replacing old HVAC systems, technicians can confirm the new equipment’s compatibility with house layouts and install them in strict conformity to the manufacturer’s guidelines.

Larson Air also sells equipment, stocking Maytag air conditioners, furnaces, and self-contained cooling units equipped with 12-year warranties. To round out its selection of gadgets, the company also sells thermostat controls and air-purifying mechanisms that strip home atmospheres of floating impurities, such as allergens and remnants of thought bubbles containing pizza.