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5 Things You Should Know When Installing an Air Conditioner

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5 Things You Should Know When Installing an Air Conditioner

Posted On: June 23, 2022

5 Things You Should Know When Installing an Air Conditioner

With the heat of the summer approaching, you may be looking to buy a new Central air conditioner.


Here are some tips to help you get the job done right! Today’s residential air conditioning systems are not as simple to install as they may appear.


Merely connecting all the tubing and wiring is just the beginning.


Beyond that, there are several important steps in the installation that can either make it or break it for you!


Here are 5 very important things that need to be done properly for your new air conditioner to last a long time.


This is how we do it day in and day out.


Number 1 - The installation of the evaporator coil (usually above your furnace) is a crucial part of a good install.


It must be installed in a way that directs all the air flowing out of your furnace, through the new matching evaporator coil.


This ensures that no air is flowing around it.


Also, the air leaks in the sheet metal work should be sealed with tape or sealant made for this purpose.


In the field, we often see an installation where the coil is mounted so that much of the air is flowing around the coil, which was never right to begin with.


We use 26 Gage Galvanized Metal Angle for this purpose because we come prepared to do it right.


Number 2 - The airspeed needs to be set at approximately 350 to 400 CFM per ton for air conditioning to work as it was designed to.


This is a very important step that is needed later when testing the level of “charge in your new system.


" Also, be sure to know the type of restrictor device your system has.


Is it a piston-type or a TXV (THERMOSTATIC EXPANSION VALVE)? It is not unusual, on a service call, to see that an installer has left the furnace fan speed set in the factory position, which is usually too high and a good indication that the charge was never checked when the AC was installed.


There can be a more negative effect on piston-type systems if the airflow is too high or low.


Systems equipped with a TXV also need to have the “bulb” installed in the correct location and orientation.


So many times, when removing someone’s old system we see the bulb still sitting in the shipping location, which means it was never working right from day one.


Number 3 - With today’s systems running on R410a refrigerant, it is more important than ever to have inert gas such as NITROGEN flowing through the copper tubing.


This is used to move the refrigerant from the outside unit (condenser) through the inside unit (evaporator).


The reason for this is that oxides can occur from the brazing process, and they contaminate the new system before it even starts.


This result can result in poor performance and a short life span of your new air conditioner.


Number 4 - It is important to test your new system for leaks before starting it up for the first time.


This is a two-part process that we follow on every installation.


The first step in this process is to pressure test all the welded joints, and since we are using NITROGEN for brazing, we just leave it connected to your new system.


Then, we pressurize the evaporator and new copper line welds up to 200 PSI for a few minutes.


If there is a leak, it will show on the gauge, and you may even be able to hear it if it's big enough.


It's not uncommon to have a small leak at this time because sometimes the position of the joint is difficult to access.


So by using NITROGEN as a first step, the system can be pre-approved as leak-free.


Number 5 - The final step we take, for all new installations or on any repair calls, is to use a Micron gauge to prove that the new system is 100 percent leak-free.


We pull our vacuums down to 250 microns using a properly calibrated digital gauge.


You cannot pull a deep vacuum, such as this, with any kind of small leak or non-condensable in the lines.


Once we establish the deep vacuum, then and only then, do we release the refrigerant from the new AC condenser that comes with a factory charge, which is usually sufficient for installations.


The final part of the start-up process is to measure the charge to ensure it is within the manufacturers' specifications.


We use digital gauges, which measure all the important things needed to be certain the system is right on the money, such as using a superheat calculation for piston-type systems and sub-cooling for systems equipped with a TXV.


We usually end up either having to add a bit of refrigerant to the system or remove a bit of refrigerant depending on the length of the tubing or other variables to dial in the charge just right.


Sometimes it takes an extra bit of time but now you are ready to enjoy many years of trouble-free air conditioning to keep your home comfortable through the hottest days of the season.



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by Marcel M, Whitby ON on Twintech Heating and Cooling

Really nice honest guys. It was a pleasure to do business with a company that does exactly what they say they’re going to do! My basement was cleaner after they installed my new furnace and AC. Thanks again Greg and Grant and for doing such a great job.

by George In Pickering on Twintech Heating and Cooling

5 star service!! I had twin tech install a high efficiency furnace and hot water tank at my home. I am taking time to write this review as a thanks for what I viewed as next level service that went above and beyond. Prior to installation they explained my specific options without pushy sales tactics and up front costs. Greg and Grant replaced a large portion of the duct work (built in their own shop) that had rusted over the years which resulted in a great looking job. It was a pleasure to work with people are passionate and take pride in their work. Following the installation they explained all aspects and maintenance of the new equipment. Products have worked flawlessly. Thanks again Greg and Grant! Highly recommend!!

by Donna J, in Ajax on Twintech Heating and Cooling

Twin Tech was great; they were honest, reliable and very thorough. I would recommend their services and will definitely be using them in the future.

by Sheila C. Pickering on Twintech Heating and Cooling

Hi Dave, Thank You Dave for coming to my aid this past summer when my AC quit. Your men did a great job installing and cleaning the area. The unit is working very well and i would highly recommend your company TwinTech. Dave you delivered what you sold and i truly appreciate it.

by Darin O. Whitby on Twintech Heating and Cooling

My experience with TWINTECH has been excellent, start to finish. While doing market research I made a list of several local companies and called them for some high-level information. Dave was the first to call me back, and the only one to book a meeting to see my place in order to give an informed, accurate estimate. He reviewed the different AC makes and models with me, explained the technology, and made a recommendation appropriate to my home. The installation went smoothly. I had one post-installation issue – there was moderate noise/vibrations coming from the duct system. I called about this, booked an appointment, and the technician resolved the issue during the service call. I feel assured having a 10-year warranty on parts & labour. I would recommend TWINTECH to anyone considering an AC or furnace for their home. Regards,

by Bill P. Whitby on Twintech Heating and Cooling

Thank you for your attention to detail regarding my purchase of a new air conditioner. Twintech arrived at the appointed time and were totally professional on the installation process completing the job quickly. PS thanks for the assistance applying for the government rebate

by Sam C, Pickering on Twintech Heating and Cooling

Dave and the guys from Twintech did a great job of installing my AC. They came on time did a nice neat job and cleaned up after themselves! Do not waste your time call Twintech first.

by Mary W, Whitby on Twintech Heating and Cooling

My AC unit was not working at all and our furnace that was still working but not giving us any trouble was over 15 years old. So I had 3 heating companies come out to give us a quote on replacing both the AC and the furnace at the same time. Two companies right away recommended that I replace both units simply because they were old. Dave from twintech however suggested that we save some money and replace the AC only because it seemed to him that the furnace was still in great shape and was running fine. He told us that he would have his technicians inspect the furnace thoroughly when they had it apart to install the AC. My husband was at home when the furnace was apart and was very impressed when the tech took him downstairs to personally show him that the furnace was in excellent working condition. He also cleaned the furnace at no extra charge. So now I have an honest heating and AC company that I can highly recommend to other home owners. Great job Thank You!

by Scott B, Whitby on Twintech Heating and Cooling

I had made the decision to replace my furnace and AC earlier this year. After meeting with several HVAC contractors I decided to go with Dave and his company. Dave was on time, polite, friendly and very professional. He took the time to answer all my questions and to explain the scope of work that would be required to do the job. The technicians arrived on time did a professional installation and completed the job on schedule. They respected my home by putting down vinyl runners to protect my floors and did a very thorough clean up. I’m very pleased with my decision to go with Dave and his team. I would highly recommend them to anyone who is considering upgrading their furnace and air conditioner.

by Mel F, Oshawa on Twintech Heating and Cooling

I have no problem in recommending Dave and the TWINTECH team to any home owner who is looking for quality heating and AC products and expert service.

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See What Our Customers Are Saying:

by Aaron on Twintech Heating and Cooling

We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.

by Linda on Twintech Heating and Cooling

Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!

by Robert Rogers on Twintech Heating and Cooling

Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.

by Robert Mizuno on Twintech Heating and Cooling

We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!

by Ruth on Twintech Heating and Cooling

TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!

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