Whether you are building a new home, remodeling your old one or simply considering replacing your HVAC system, this article is for you. As Maryland HVAC installation and repair professionals, at Cool Breeze we frequently run into poor HVAC installation jobs performed by inexperienced contractors. They may not be disastrous, but they usually lead to increased energy bills and lack of indoor comfort, which is the opposite of what a good HVAC system is supposed to do. If you recognize any of the below HVAC installation mistakes by looking at your own system, get in touch with us and we’ll be happy to offer you suggestions for correcting them.


A thermostat is a part of the HVAC system that you most frequently interact with to set the right temperature. However, in order to heat or cool your home to the right temperature, the thermostat first needs to read the right temperature. And by “right” we mean the average temperature of the room it’s in. When a thermostat is placed next to hot or cold source, its reading may be skewed, and so will be its settings.

For example, a thermostat placed in direct sunlight may read that the room temperature is 79F, while in fact it’s 75F. So if the AC is set to kick in at 77F, it will start cycling sooner and will keep your room cooler than you prefer. When planning for a good spot for a thermostat, be sure to evaluate the surroundings and eliminate any external factors that may skew the readings.


Return air vents are essentially holes in the floor that allow for the indoor air to be fed back into the AC unit or furnace to be cooled or heated respectively. The problem is, they are not exactly attractive, so some homeowners try to cover them up or tuck them away. In some older homes, you may find return air vents in closets and other out-of-sight places where they often end up covered up with boxes or furniture. When return air supply is restricted, the blower fan will try harder to pull the air in, which may shorten its lifespan significantly.

The same concept applies to your outdoor AC unit, furnace, evaporator, heat pump and any other HVAC equipment. Don’t try to cover them up, because all of these devices need a room to “breathe.”


An HVAC system is more than just a condenser, evaporator and a furnace. It’s a complex system consisting of air ducts, air supply and return vents, insulation, ventilation and many other aspects. The power and capacity of your AC unit or furnace, as well as the number and placement of vents should be proportionate to the size of your home. If you own an older home and feel like your heating and cooling bills are too high or the temperatures are uneven throughout the house, it’s possible that this is due to the poor design of your HVAC system.

Air duct sizing plays a big role in the overall performance of your HVAC system. Air ducts that are too narrow may create excessive air velocity, which in turn may create drafty conditions and contribute to noisy HVAC operation. On the other hand, air ducts that are too wide may make it difficult to dial in the proper air flow and may cause your equipment to work more than necessary.

When you are looking for someone to install your new HVAC equipment, it’s important to hire a Maryland HVAC contractor who treats both HVAC and your home as a system. At Cool Breeze, we always take into account your comfort and the energy efficiency of your home, rather than simply installing equipment.

Give us a call or contact online for a free estimate or consultation.