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How to install the HVAC system?

By Farrukh Jhanzaib
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The HVAC is responsible for providing you with the required temperature; it also improves air quality within the house. How to install the HVAC system? Suppose you haven’t installed the HVAC unit in your house and want one. Don’t worry; this article will help you know everything necessary.

You should hire any technician to do the work for you; however, if you’re an expert in understanding the wiring, electric structure, and gas mechanism, you can install the HVAC unit all by yourself.

We have devised a step-by-step guide for your understanding. Read thoroughly to get a clear picture.



Suppose you have a roadmap to install the HVAC; you have done 50% of the work. And if you don’t have one, then what are you waiting for? Devise a plan and work accordingly.

You should have a plan for supplying and returning ductwork and marking suitable places. Ductwork is responsible for the movement of air, whether it is cold or hot.


Make sure you choose a place for supply and return ductwork when air doesn’t have to cover a long distance because distances can affect the temperature of the air.


Also, plan to fix the thermostat in a central place where the temperature of the entire house remains equal.


Dampers are useful for spreading air across the house. For example, if a small room needs a small volume of air, the damper will reduce the flow of air in that room. This will keep the room from getting colder or hotter.


Another important thing that guarantees the efficiency of your system is air filtering. These filters are installed in the return ductwork. They make sure the filtered air reaches your unit. That’s how you can increase the lifespan of your unit.


And, in the end, you or your technician need to measure the size of the house, the availability of a place to put the system, and the climate of your region to finally install the unit.


Installation of the ductwork:

Now that you have planned everything, it’s time to install the system. You’ll start with installing the ductwork. For that, make sure you have taken care of these things.


  1. If your house is in the final phase of construction, make sure you have done electricity work.
  2. That ductwork needs joists and studs for fixation. Therefore, if you haven’t completed electricity work beforehand, you’ll have to readjust everything.
  3. Moreover, the benefit of completing the electricity work beforehand is that you can test the first performance of the unit.


People usually install these ducts in the basement. However, you can install these ducts in the walls of the house.


There are different types of ducts; some are flat, some are round, and some are flexible. Try to use the flexible ones in smaller places where they can bend or mold easily.


When fixing the ducts, try to keep minimum bends, for that can curtail the smooth flow of the air. The slower the air is, the weaker its efficiency is.


Installation of the system:


Now that you have installed the ducts, this is the right time to install the heating and cooling system.

Note: Heaters are installed indoors, and some components of air conditioning are installed indoors and some outdoors.

Before installing the heater, make sure that the electricity and gas supplies are off. Double-check that, and then connect the heater to the supply and return ducts.


Do you know about cooling coils?

Well, these coils are fixed above the heaters so that they don’t get too hot and shut down.

Installation of Air Conditioner:

After the installation of the heater, it’s time to install air conditioning.

You must take off the panel on the outside unit that is above the gas lines before placing your air conditioning system.

There are two main components to the outside unit. The refrigerant is compressed and condensed by a condenser unit first. The second component that helps dissipate the extra heat produced during the compression of the refrigerant is a fan.

The panel containing the gas valve’s electrical connections is where the unit’s electricity is located. 


You must connect the cables for your thermostat after you have connected the wires for your electricity.

You will need to solder your gas lines after installing all of your wiring. One big gas line and one tiny gas line will be present.

Your outside installation will be finished once you solder them to the matching gas valves on the outdoor unit. The valves must remain closed until the installation is finished in its entirety.

When purchasing a new air conditioner, the system is often pre-charged with refrigerant. As of right now, your gas lines are not sealed because you have only completed half of the installation. You must put the evaporator coil above your heater before you can open the valves.

Where do I need to install evaporator coil?

You should install the evaporator coil above the heating unit. Your supply ducts should have previously considered this in the event of new construction, giving you adequate space to put your evaporator coil above your heater.

Self-tapping screws are required to fasten the metal box that houses your evaporator to the top of your heater. The box is provided with your heater.


Following the steps we outlined, when connecting your heater to the supply duct, you must connect the top of the box.


Next, you must use duct tape and duct sealant to seal off the inside joints. Tape off the joints first, then use a paintbrush to apply duct sealant, letting it dry. After connecting the evaporator box with the duct, you can insert the evaporator coil and replace the front panel.


Next, you can solder the gas lines that run from your outdoor unit to the evaporator coil. Finally, once you have installed everything, you can go back to the outdoor unit to open the gas valves. Now you can turn on the unit. Here, you’re ready.



We hope that this article will educate you about the entire process of installing the HVAC. We advise you to hire a professional for this task. Moreover, this article is also helpful for professional installers.

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