HVAC Repairs & Installations: Understanding Heaters, Air Coolers & Ventilation


HVAC System Parts and their Functions

Understanding these different parts of the system tells us how they work together to make our lives pleasant and convenient. There are several models of HVAC systems available in the market, with special features to make our homes even more comfortable. Though there are some differences in the details, the core components remain the same. According to several HVAC experts, there are four main parts that are common to all heating, ventilation, and air conditioning systems.

The Heater

As the name implies, this particular component of the HVAC is responsible for heating. The air in the home is drawn into the HVAC system’s ductwork via the return vent slats, then it is heated with a heat pump or a furnace, then it is re-circulated again in the home through the supply vent.

Heat pumps actually have a dual function and are able to both heat and cool depending on the placement of the hot and cold coils. When it acts as air-con, it has the capacity to make outdoor air cool, which then blows the cool air into the house. When it is on heating mode, the hot and cold coils are placed in reverse, so it blows warm air into the house.

The other type of heating device is the furnace. This is the more popular choice that is common in most households. It utilizes natural gas or oil to heat the air. Inside the furnace, there is a tool called a heat exchanger. This is the heart of the furnace that is responsible for making the air warm to the right comfortable temperature that we want. Typically, this furnace is located in the basement. Some houses have them in their attics, or they are hidden in a specialized closet that camouflages its existence.

The Air Conditioner

This machine is responsible for cooling the air and it is often a split system because it works between an outdoor exterior unit called a compressor and condenser, as well as an indoor interior unit called an evaporator coil. Connecting the two units is a copper type of tube which contains the refrigerant, which is a critical feature because it begins the cooling cycle.

The compressor that sucks the hot air, transforms it into cool air by passing it through the condenser and the refrigerant. While cooling, a fan blows the excess heat outside of the home. The refrigerant is then pumped into the evaporator coil, where it turns to a cooler and drier air. This cool air is what blows into the rooms of the home making the house comfortable even if it is too hot outside.

The air conditioning unit relies on electricity and a coolant to cool down the temperature of the air. Its primary function is to send hot air outside the home and replace it with cool air. The cycle of cooling air is repeated over and over again to keep the desired air temperature

The Ventilation

The ventilation is a system in itself, which is made up of return and supply vents, air filters, a circulating fan, and ductwork. The intricate network of ducts, which look like gigantic pipes, snake around the interior of the house, with its tips ending in different vent slats in various rooms. This is the transit system for the hot air coming from the furnace and the cold air coming from the air conditioner.

The circulating fan is responsible for pulling the air inside our home through the return vents, pushing it into the ductwork, and finally over the furnace or the air conditioning unit. Later, it pushes the same air back to the rooms through the supply vents. The air filters keep the air free from particles and dust mites, and they often need replacement from professional companies offering HVAC services.

The Thermostat

All of us know what this thermostat is because it’s what we use to set the temperature of our homes. This thermostat is akin to the brain of the entire HVAC system. It can turn our system on or off, control the temperature, and also operate other features installed with this system such as remote operation from your iPhone app.

The thermostat is sensitive to heat and is accountable for controlling the temperature of the home. It also has the unique capability of responding to the current ambient room temperature by itself. We begin by setting the temperature manually of our desired degree of Fahrenheit.

This temperature we have chosen is called the set point. If the thermostat senses that the home temperature is above or below the setpoint, then it will act accordingly by turning the furnace on or off. This particular sensing function is dependent on the bimetallic element, which contracts or expands when there are changes in our home temperature.

Bottom Line

The HVAC systems found in our homes are not as complicated as we all think. It relies on a heater and a cooler to get the air to the right temperature. The air is then circulated through the house via the intricate network of ducts and vents. The thermostat is the brain that controls the entire system. The most important thing to remember is to do routine maintenance and inspection of our HVAC systems because we use it every day. Don’t hesitate to call the best hvac repairing company in your area for a thorough HVAC inspection.