HVAC Systems We Install

Package units are an all-in-one AC and heater, usually on the roof. Some can be on the ground, but will have large metal duct connecting it to the house. They come in AC w/ electric heat (heat pump) or AC w/ gas heat. 

Split Systems are the most common type of AC unit. It has 2 seperate sections with the condenser being outside, usually on the ground, and the furnace (or air handler) inside a closet, garage or attic. There is only 2 small copper tubes connecting the outside section to the inside section (freon lines).

Mini splits have 2 separate sections. The condenser goes outside and the air handler goes inside, usually mounted on a wall. They don’t have any duct. The air comes right from the wall mounted air handler and blows into the room. They are used to cool a single room. Great for additions, Arizona rooms, garages, or stand alone guest houses. They are very efficient way to cool or heat a room.

Unit conversions are typically for older houses that have a specific type of split system that has a furnace inside a closet and a condenser/AC hanging on the side of the house. We replace these with standard package units or split systems.

HVAC Accessories

Electric heat strips can be installed in heat pump units as a secondary source of heat during winter. When the outside temperature is below 45 degrees, heat pumps have a hard time heating, so the heat strips only engage when it knows the unit is struggling in heat mode.

Air filters are usually thought to clean the air in your house, but they are really there to keep the indoor coil clean. For a filter system that actually cleans the air at a high level, special filters need to be installed, and sometimes new filter racks or larger filter grilles need to be installed as well. We can design a filter system perfect for you needs.

UVC lighting is one of the best ways to kill bacteria and viruses. They are used in hospitals and clean rooms. We have a variety of UVC lighting systems that are installed in the unit or duct to safely kill bacteria and viruses. Starting at $350 for a UVC light system, installation, and tax included. 

We offer thermostats for every need. Simple thermostats with large displays and only 3 buttons are perfect for most people that want something easy to use without all the complicated features. The next step up is adding a programming schedule to it. If you want to control your temp from your phone, we also offer several WIFI thermostats that are reliable, unlike some new brands that have entered the market. We will help you choose the best thermostat for your home.

Zoning systems are used to control rooms or sections of the house individually from each other. They work well if you have 1 or 2 rooms that you like to keep at a different temperature than the rest of the house, or if you want to control all the bedrooms on one zone and the living room/kitchen on another zone. This allows you to focus the air into a specific area and not waste air by cooling areas that aren’t used. Remote temp sensors are installed in the zoned areas. Call for more information.

Safety switches are typically installed on split systems when the furnace (or air handler) is installed in the attic or closet. They are used to shut down the unit if the drain line gets backed up to prevent water from overflowing out of the unit onto drywall.

Water sensors alarms are typically placed below an AC unit or next to a water heater. They will sound an alarm, turn an indicator light on, and/or shut down the AC unit when they sense water. Different configurations can be installed. 

Guide to Buying a New Air Conditioner

Lennox air conditioner and heater system

What is SEER rating?

Is higher efficiency really worth it?

SEER rating stands for Seasonal Energy Efficiency Rating, which is a number to describe how efficient the AC is. 14 SEER is the new minimum that can be sold in Arizona. but manufactures offer units ranging from 15 to 24 SEER. 15 and 17 are by far the most common due to the efficiency per $. 

16/17 SEER is when most manufactures change to a 2-stage unit, which means the compressor and fan motors will run in low stage most of the time to maintain the temperature inside. First stage is typically runs at 60% capacity, which means a significant amount of power savings. When the house needs to cool faster, it will automatically switch to second stage and run at the full capacity.

Although there are several other A/C units with different SEER ratings, we recommend getting 2 stage units in most cases. But, every home and every family have different needs with different variables, so give us a call or email to help decide which one is most fitting for you and your family.

What size AC do I need?

The size of an air conditioner is called tonnage, or ton for short. Sizes come in 2-ton, 2.5-ton, 3-ton, 3.5-ton, 4-ton, and 5-ton for residential.

Professionals determine the right size for your house by taking several things into account, mainly the size of your home. Generally speaking, 1-ton of air conditioning will cool 400-500 sq. feet. We typically find most houses work best using closer to 400 sq feet per ton to ensure the house will maintain temperature during hot afternoons without running for several hours. 

Windows, ceiling heights, insulation in walls and attic, wall type, location, facing direction, occupancy, and the desired temperature are used to calculate a more accurate size. In most situations the new unit will be the same size as the existing unit.

The phoenix area is different than most areas in the country, so “general rules” of sizing will be very different here than the rest of the country. Determining a size should be done by experienced technicians that are familiar with the local climate. 

New AC condenser salesman and customer

Types of Air Conditioning Units

Lennox package unit, rooftop, heat pump, air conditioner

AC w/ Gas



AC w/ Gas


mini split

Heatpump or AC Only

New AC Price Guide

IMPORTANT - Government changes at the beginning of 2023 caused a price increase, and they are implementing more changes next year, which will unfortunately raise prices again. Comair is working hard to find discounts, rebates, and good financing options to help our customers.

Please call or email to get a free estimate.