How to Set Up an HVAC System

HVAC systems are crucial to keeping us comfortable. They circulate air and provide temperature control. What makes a great system, though? As HVAC experts, we know that it’s all in the details. Here, we lay everything out, from planning the system to putting it together to checking its ultimate performance.
Requirements for an HVAC System 
If you’re looking for quality, you’ll want to be sure of the following things.

Check each room for heating and cooling loads. The size of a room is a big consideration when determining proper air flow.
Get a duct that will bring air into the room. You’ll also need a return system that will ensure proper circulation.
You’ll want to be able to satisfy those computed loads from step one. For that, you’ll need a handler that monitors the air pressure so that it stays within the requirements that it was designed for.
You need to make the return and supply systems work in harmony. Balance is key to keeping pressure neutral in each room and throughout the home.
Make sure you’re not losing (or gaining) any heat around your handler and register.
A funky odor can ruin your hard work. Check that no car exhaust or stale attic air is getting into the air conditioning. A good seal on your ducts can help with this.
Pressure gauges will help you know if your refrigerant is charged. You’ll also want to double check your burner.

Putting it Together: Your HVAC System
Grab your ACCA manuals and handbooks (or whatever guides you prefer; we’ll reference ACCA literature here) – you’ll need them for putting together and maintaining your air-conditioning system.

Determine the loads and airflow in each room that you are servicing (refer to Manual J).
Handbook D will be your friend when it comes to sizing up your potential duct system.
You’ll want to consult Handbook S to get your practical load just right.
You may run into construction jams when putting together your HVAC. By laying your duct system out, you can properly anticipate potential issues given the various limitations of the space.
Manufacturer’s specifications will come in handy when installing everything. As you’re going about it, make sure there’s nowhere that might leak air.
Before you really turn up the heat, see to it that your furnace burner and firebox are operating correctly.
Refrigerant charge comes down to properly tuning your superheat and subcooling. Measure them with care.
To keep your HVAC system humming, do one last look around for leaks, as well as spacing and air flow return. Finish up with a static pressure check.