An Ultimate Guide To HVAC System

An Ultimate Guide To HVAC System


An AC unit is made up of a number of complex, interrelated components. Small issues can turn into major breakdowns if you don’t act quickly to solve a problem. There is much that needs to be understood when it comes to air conditioning units, from installation and maintenance to repairs and how they function.

Basically, this article is the ultimate HVAC guide that will assist you to have a better understanding of how heating and cooling machines operate, as well as how to:

  • Adequately maintain the unit. Notice typical problems
  • Know if it’s time to replace or repair the unit
  • Have a better understanding of house automation and smart HVAC
  • Choose the proper unit to buy

The best way to appreciate an HVAC unit is to look at the heating unit’s essential parts. The system comes with three main components: The distribution system, the control (thermostat), and the heat source.

  • A heating unit is made up of:
  • The source, like a heat pump or furnace.
  • The distribution unit, like the radiator.
  • The control, which controls heat distribution.

You can identify a furnace by the source of fuel; natural gas, oil, or propane. On the other hand, with a boiler, you mainly look at the size; if you live in a warm region, you will require at least 20 BTU for each square foot and more if you live in a colder area.

As for a heat pump, it is utilized in central heating or cooling machines. The gadget makes use of outside air to heat up the interior of the house. The pump distributes heat energy all over the house. All you need is one ground source such as an air source to warm-up the whole house.

Air Conditioners

Air Conditioners work by getting rid of heat and providing cool air into your home. There is a set of refrigeration parts that extract the heat. Common types of air conditioners include:

Window or Room Units

These are installed close to the window, and they have a lifespan of up to 15 years.

Central Units

These use the duct system to blow air evenly and consistently throughout the house, and their lifespan is 20 years.

The Split Unit: this works both as an inside and outside the system, and it can run on electricity or gas.

The Mini Split Unit: You don’t need ductwork with this kind. You can have it as a new installation or installed as an update of an already existing one. Its lifespan is about 15 years.


To get a better understanding of HVAC units, you need to know about the following components:

Air Filter: The filter blocks or traps pollutants such as mold spores, pollen, and dander, improving the quality of air indoors.

Blower: A motor powers it, and its function is to carry air via the AC unit.

Burner: Uses both air and gas to keep an ignition flame inside the heater.

Condenser: It is placed outside the house, and you link it to the evaporator coil. Its function is to cool the refrigerant gas and then change it into liquid form.

Ducts: These are pipe-like features that bring air into every room. They are typically made with fiberglass or sheet metal.

Evaporator Coil: It is made up of tubes that carry liquid refrigerant to absorb warm air by evaporation.

Gas Valve: This is a component of a furnace whose function is to regulate gas use.

Heat Exchanger: Absorbs and warms up cool air, which will be distributed around the house.

Igniter: Pilot light used in a gas-powered furnace. It supplies the gas, which will be utilized as fuel.

Thermostat: This interface enables you to regulate the temperature of the HVAC unit.

Vent: It is also referred to as a register, and its function is to channel air in a particular direction.


The Proper Maintenance And Upkeep Of An HVAC Unit

Taking good care of all your household appliances or machines is always important, and the same goes for your HVAC system. A skilled technician should be called in to service the unit at least two times a year. That way, the unit will work more efficiently, and you will have fewer bills.

Effective methods to maintain the HVAC unit include:

Replacing Air Filters: make sure that you replace the filters every one to three months. When to change them is normally determined by the kind of unit you have and where you live. Although it can be changed after three months, make certain that you check it every month to ensure it’s not dirty. If it is, clean it or change it.

Outdoor Contraptions Must Not Have Any Debris: The debris includes pollen, leaves, twigs, and branches.

Clogs: Any build-up in the unit must also be cleaned. You can do this by mixing bleach with water and pouring the mixture into the condenser drain. This can be done once per year, and it will get rid of algae and mold.

Check the Entire System: Frequently, but more importantly, just before winter kicks in, inspect the machine to see if there is any damage or any part that requires attention.

Examine the Refrigerant Lines: They transport refrigerant into the house, and they can leak or wear out, causing insufficient pressure and below standard performance.

The System Must Always Be Level: If it is tilted, the chances are that it will not function well. Check to see if the unit is level frequently; every 2 to 3 months.

Examine the Fan Blades: this should be done by a professional technician every time he comes to service the unit. But you can also check on them now and then.

You Must Not Close Over 20% of The Registers: For the system to work well, at least 80% of the registers should be working.

Watch Out For Noises and Strange Smells: If the unit is indoors and hears strange noises or strange smells, there might be a problem with the unit.

Advantages of a Service Plan

If you have a service plan you will be guaranteed routine maintenance. Servicing the unit also prevents future problems. Having the unit serviced has the following advantages:

Fewer Energy Bills: The fact of the matter is that if a heating or cooling system is not properly maintained, it will not function efficiently. This means that you will be using more energy. More energy results in more energy costs. So, regular maintenance is essential.

Better Indoor Air Quality: If the unit is well maintained, little to no pollutants will be released in the house. Enhanced air quality is necessary, especially for those people who suffer from respiratory diseases.

Lesser Repairs: If a problem is identified in its initial stages, such as during routine service, it can be attended to early. This helps to avoid future and more costly repairs.

Durability: Failure to maintain the unit recommended by the manufacturer can result in you having to replace it in less than five years. However, frequent maintenance will give you value for your money as it will last for a long period.

Typical HVAC Issues

Some of the typical issues include:

Irregular Heating or Cooling: Temperature should be distributed evenly in every room of the house. If that is not the case, there might be a duct that is blocked.

Noise: If you hear strange noise, the problem could be the motor.

Electrical Failure: Electrical wires can cause fans and compressors to stop functioning due to wear and tear over time. The wires should be replaced by a professional.

Dirt: Dirt can affect both outdoor and indoor systems. Therefore, clean the units regularly.

If you or someone in your family is having more allergic symptoms than usual, it could be a sign that there is dust, mold, or mildew in the unit’s ducts. The symptoms can be reduced by simply cleaning the ducts.

Article provided by On the Spot HVAC Plano TX