One of the key considerations you’ll have to make whether you’re building a new home or updating the HVAC in an existing one is whether to heat and cool the entire house with one central air conditioner or split the load between two smaller ones. In most cases, the cost of installing two smaller units will be higher, but in other cases, it may still be a sensible choice, both for comfort and long-term savings.

What Size Furnace Or Air Conditioner Do I Require For My Home?

This is an often asked question, and it’s an essential one. Because you will waste money and energy if you get an HVAC system that is too large, you won’t have enough chilly or warm air flowing through your home if it’s too small.

Many individuals believe that determining how many HVAC units to install is as simple as multiplying the square footage of their home by the number of rooms. In actuality, the ideal number of units and their sizes are determined by a variety of criteria unique to your property. The number of windows facing specific directions, the insulation level of your home, the age of your property, and even the number of trees and plants in your yard are all factors to consider. The climate in your area also has an impact on the number of units you should install.

In some cases, however, there isn’t much of an option. The most powerful domestic air conditioners are 5-ton systems (ton here refers to cooling capacity, not the actual weight of the unit). If your home is so enormous that it would require six tonnes or more of cooling to keep it cold, you’ll need two or more units. But what about cases where just one or two units are available? When you have a multi-story home, you may want to consider installing two units. Because heat rises, it might be difficult to appropriately cool an upper floor without freezing the people below.

Furthermore, you don’t want to waste energy by over-cooling the lower floors, especially if you’re sleeping upstairs all night. So, for both comfort and efficiency, two independent units controlled by two thermostats, one for upstairs and one for downstairs, make sense.

There are two main procedures to determine an accurate HVAC size. However, there are other details to consider during the procedure.

Step 1: Find Out How Many BTUs Of Heating And Tons Of Air Conditioning You Will Require

A Manual J calculation for your home is the best approach to find the ideal HVAC unit size. The Manual J calculation is the most accurate measurement available since it takes into account elements such as:

  • Square footage
  • Climate zone
  • Ductwork
  • Number and style of windows
  • Natural shade or sunlight
  • Quality and amount of insulation
  • Number of people using the space
  • Heat-generating appliances

If you ask, many utility companies will supply you with a free energy audit that will include your Manual J calculation. You can also have your audit done by an energy auditor or an HVAC dealer.

You’ll know exactly how many British Thermal Units (BTUs) of heating and cooling you need for your property if you have a Manual J report.

Step 2: Select Which Unit To Purchase

Now is the time to contact an HVAC dealer to learn more about the heating and cooling options available. Don’t be concerned if the dealer doesn’t have your exact BTU size. If your BTU requirements are in the middle of a range, choose the larger unit. For example, the Manual J computation may indicate that cooling requires 25,000 BTUs. Your HVAC vendor, on the other hand, only sells air conditioners that can take 24,000 or 30,000 BTUs. To ensure that your comfort demands are met, choose the 30,000 BTU unit.

It’s not bad to have a little more power. This will ensure that your HVAC system can withstand the load on days when the temperature is extremely high or low. If you get a new AC unit that is too tiny, you may come to regret it during the warmest and coldest days of the year.

As you can see, there are a number of things to consider when considering whether a home needs one or two HVAC units. A specialist can assess your home’s unique requirements and assist you in determining what is ideal for both your comfort and your wallet.