How do you know if you’re choosing the right sized HVAC unit? Should you buy a large unit or a smaller one?

Whether it’s for your home or office you want to be sure you choose the right HVAC unit that will fit your needs. It’s in your best interest to purchase the right size of unit or system that will keep you cool and comfortable. HVAC units that are too big will use more electricity and possibly leave more humidity in your home that before. However, if you buy a unit that is too small it will not cool your home or office efficiently.


What is the Right Size Unit For Your Home?

To ensure you buy the right sized unit, take a few minutes and measure the square footage of the room that you will use it in. If your room is oddly shaped and not square or rectangle, divide the room into sections that are composed of square or triangle. Then take those measurements of the room.

Next you want to figure out the square footage of each room in your home if you will be installing central air conditioning. A simple way to figure this out is by reviewing your tax statement of your property or calling the county auditor’s office. If you have a basement, don’t include it. Take into account the cooling capacity that is needed for the areas that you will be using an HVAC unit in.


Why Size Matters

You may be thinking that a bigger AC unit is better than a smaller one. But that is not always the case especially if you want to properly cool your home. You will want to pay attention to size.

If you purchase a HVAC unit that is too big, it will work hard to cool your home quickly. However, the downside is that the unit will also turn off quickly as well. When this happens, the unit will not be able to run through the proper cycle it needs to and warm air will build into your home. Your AC unit will turn back on again to cool your home again, this is not very efficient and can cause your electric bill to rise.

If you purchase a smaller sized unit, you will need to have it on constantly in order for it to cool your home. It can have a hard time keeping your home at a comfortable temperature and also cause your electric bill to be higher than normal.


Different HVAC Unit Sizes

Keep in mind when purchasing a new HVAc unit that they come in several different sizes that use a unit of measurement called “tonnage”. A ton is not considered the same as a measurement of weight, it’s the measurement of the AC unit’s ability to cool 12,000 British Thermal Units or BTUs. BTU is the energy that a unit needs to change the temperature of a pound of one by just one degree. What that means, is that a HVAC unit that weighs 2-tons can cool 24,000 BTU by one degree in an hour.

With that in mind, you may think that a unit that has a higher tonnage would cool your  home with no problem at all. But if the unit is too large, it will cycle on and off more frequently and cause your electric bill to increase. Finding the right sized unit that will work for  your home is done by determining the square footage. If you have a floor plan then it will make this process easier, but if you don’t you can measure each room then calculate the total of each room. Next combine them to find the home’s total square footage, multiply that total by 30 and divide the answer by 12,000.


Energy Ratings

After you have calculated the right size needed for your home, you will want to take into consideration energy ratings. HVAC units that have met the requirements of the EPA receive a rating for their electric efficiency and the blue star  logo. Units that have a higher rating will be more expensive initially but in the long run your investment will be worth it. These units will help reduce energy costs and also protects the environment.



Let Us Install Your Unit

If you have questions or unsure of what HVAC unit to purchase, you can contact one of our certified technicians to assist you.They are proud to install, repair or provide maintenance for your HVAC unit.We are available 24/7 and will be at your doorstep A.S.A.P! Call us today at (808) 877-COOL or fill out our online form at