What is an HVAC System?

The HVAC industry is constantly changing, and innovations are emerging. These include intelligent systems that connect to the internet and green technologies that reduce carbon footprints.


The first thing you should know about HVAC is that it moves air throughout your home to adjust the temperature. It also carries air through ducts and removes excess humidity from the air. Visit https://promastersheatingandair.com/ to learn more.

An HVAC system is the equipment used to regulate temperatures, air quality and humidity in homes and commercial or industrial spaces. It also may be responsible for ventilating these spaces to dilute harmful chemicals and odors from occupants, volatile organic compounds from interior furnishings and other sources. The equipment performs all of these functions by using a combination of heating, ventilation and air conditioning units as well as ductwork and thermostats.

A basic HVAC system consists of a furnace, air conditioner or heat pump, evaporator coil and blower fan. Its primary function is to create a comfortable indoor environment by heating and cooling the air in accordance with human comfort and health requirements. The system is powered by either natural gas or electricity and may use a variety of fuel sources, including solar energy.

The HVAC system’s air intake point is located at the top of your ductwork, which it uses to draw in fresh, clean air. The air passes through an air filter to remove any contaminants and is then funneled into the main part of the system. The blower in the air handler is then used to circulate the conditioned, cleaned air throughout your home or space.

While most residential and commercial HVAC systems are forced-air, a ductless mini-split system can be utilized for certain needs or applications. These unique systems are more expensive initially, but allow occupants to control the climate in their own space rather than having to share a central unit.

AFUE-Measures the furnace’s efficiency in converting fuel to heat energy. A higher AFUE means greater efficiency and lower fuel costs.

SEER-Measures air conditioner or heat pump efficiency, and a higher SEER rating is more efficient. HSPF-Measures the heating efficiency of a heat pump, and an HSPF of 7.8 or more is considered high.

A packaged system contains all of the components of the heating and cooling in one self-contained unit, which makes it easier to maintain. This type of system is often installed on rooftops to save space and can be especially beneficial for larger homes in warmer climates.


Ventilation is the part of an HVAC system that brings in fresh air, reduces humidity levels and ensures a uniform temperature in different areas of a home or office. It includes the air handler, ducts and return vents as well as the blower assembly. Without proper ventilation a home or office would not be comfortable to live in because bad air wouldn’t get out and good air wouldn’t come in.

A good ventilation system should have an air filter, which should be changed regularly to keep the system clean. This will help to reduce the number of contaminants in the air such as dust, pollen, pet dander and chemicals from cleaning products. It also helps to reduce static pressure loss in the system and saves energy by lowering the amount of power needed to operate the fans.

Another component of a ventilation system is an exhaust fan which removes gases and moisture from the building. This helps to reduce the risk of mold, mildew and other problems and is particularly important for indoor pools. Ventilation systems can also include a carbon monoxide detector, which will alert occupants to the presence of CO and other toxic fumes.

Highly efficient ventilation systems use less energy to operate than conventional ones, which contributes to reduced electricity bills and helps with environmental concerns like climate change. They can reduce energy consumption by up to 40%. These systems require specialized design and engineering during the construction phase to achieve their full potential. They are most effective in buildings with good insulation, airtight envelopes and efficient heating and cooling systems.

Air conditioning is an essential part of a good ventilation system and can be provided by central air conditioners, window ACs or ductless mini-split systems. Air conditioning helps to improve comfort levels during the hotter months and is important for maintaining thermal comfort in buildings.


An HVAC system includes heating and cooling units to control temperature, humidity, air purity, and ventilation in homes, schools, hospitals, and commercial and industrial buildings. Its design is a subdiscipline of mechanical engineering, based on principles of thermodynamics, fluid mechanics, and heat transfer. The term “HVAC” is most commonly used to refer to a climate control system that combines heating, ventilating, and air conditioning.

Ventilation is a key element of all HVAC systems, and it may take place naturally or using mechanical means like fans and ducts. This process draws outside air into a building through open windows, doors, and cracks, and it brings in fresh air from the outside. Then it distributes that air throughout the building through a network of ducts.

The most familiar component of an HVAC system is the air conditioner, which cools indoor air during warmer periods. It removes heat from the air by using a cycle that involves the evaporator coil, compressor, and condenser. The refrigerant in the system changes from a liquid to a gas and back again as it goes through this process, and it’s this transformation that lowers the indoor air temperature.

HVAC systems can be configured in different ways to suit the needs of each building. Some use a central air conditioning unit with ductwork that distributes conditioned air to rooms through a series of vents and registers. These systems are most common in homes and large office buildings. Others use ductless mini-split systems that exchange cooled air directly with living spaces and don’t require any ductwork.

When choosing an HVAC contractor, look for one with NATE certification. This indicates that the technician has passed rigorous exams to prove his or her knowledge of HVAC technology. In addition, it’s important to find a technician who is licensed and insured.

In between maintenance visits, you can keep your HVAC system running at peak performance by replacing the air filter regularly. This will help prevent the airflow from becoming clogged with debris, which can lead to insufficient cooling and higher energy bills. It’s also a good idea to trim any plants and other debris that might get in the way of the outdoor AC or heat pump. This will improve airflow and help the equipment last longer.


Just like your car needs regular oil changes, so does your HVAC system. Without routine maintenance, your HVAC unit can start to show wear and tear, which may result in costly repairs. Oftentimes, you can avoid these repair bills by scheduling an inspection and having your HVAC technician perform minor services.

The two most basic forms of HVAC maintenance are regularly scheduled filter changes, as well as evaporator and condenser coil cleaning. By keeping these items clean, your HVAC unit can operate efficiently and your occupants will benefit from cleaner indoor air. In addition, your HVAC technician can check for and replace belts that have begun to crack or break. If left unattended, these issues can lead to your system’s safety limits tripping, which could shut down the system or cause other problems with your equipment.

Routine HVAC maintenance also prolongs the life of your system. An average system can function for close to 15 years if properly maintained. By catching small issues during routine inspections, you can extend the lifespan of your current system and put off the cost of replacing it.

When your HVAC system isn’t well-maintained, it loses 5% of its efficiency each year. That’s a lot of money that you’re losing out on, not to mention the wasted energy that it produces. The best way to save on energy costs is by having your HVAC system inspected and serviced each year.

During these maintenance visits, your technician will inspect and test all of the components. They’ll also thoroughly clean both the interior and exterior units, which allows your system to operate at its maximum efficiency. In addition, they’ll clean the air ducts, clip any grass or shrubbery around the outside unit and clear debris from the inside vents. This will help prevent dust and mold from building up in your home, improving indoor air quality for your occupants. Moreover, a professional will clean the air filters and evaporator coils to prevent the build-up of dust, allergens and bacteria that can trigger respiratory illnesses. They’ll even disinfect and deodorize the system to remove any unpleasant odors from your space.

HVAC Service and Repair

HVAC repair

HVAC technicians specialize in installing, maintaining and repairing climate control systems. Their job involves ductwork, furnaces, heat pumps, air conditioners and other equipment. Most HVAC technicians at https://hubbardmechanical.com/ receive training through vocational schools or apprenticeship programs. They are also required to have strong problem-solving skills and excellent attention to detail.

When looking for a quality HVAC repair company, it’s important to consider their licensing and insurance coverage. Also, read online reviews to see what previous customers have said about them.


When your ductwork lets air escape, your home will be less comfortable and your HVAC system will wear down more quickly. If you suspect a leak, hire an HVAC professional for ductwork repair. A leaking duct can cost you about 20-30% of your cooling energy.

Ductwork problems often involve mold, insects and debris. You can help prevent these problems by removing rodent droppings and other signs of infestation, regularly cleaning your ductwork and using pest control products in and around your house. It’s also a good idea to keep an eye out for a rancid smell, which is a sign of mold and mildew.

Air ducts are most likely to be damaged by holes or clogs, but they can also suffer from structural damage or be missing entirely. Most ductwork repairs involve patching holes and sealing cracks. This is usually cheaper than replacing a whole duct, especially if the ducts are fiberglass lined. Professionals can use a special type of tape designed for ducts to seal the hole. This tape is backed with a flame retardant to avoid fire hazards.

Leaking ducts are another common problem, and they can be hard to diagnose. A pro will either remove vents and look inside them or send a camera down the ducts to see where the leak is coming from. The more difficult a duct is to access, the more it will cost to repair.

Dirty ducts are a breeding ground for dust and other pollutants, which can clog your system and cause asthma and other respiratory problems. The best way to keep them clean is to vacuum your vents on a regular basis. You can also help prevent dirt and dust build-up by installing a filtration system in your home.

When a duct isn’t properly insulated, your heating and cooling bills will be higher than they should be. Insulation is especially important for ducts in unconditioned spaces, such as attics, basements and crawl spaces. In addition to reducing your energy costs, a well-insulated duct will also help reduce the noise from your AC running.


The thermostat controls your home’s heating and cooling system. It tells the furnace and air conditioner what to do, how much energy to use, and when to turn on and off. There are different types of thermostats, including digital and electro-mechanical models. Each type has its own unique issues and repair methods. The most common problems are related to the device’s electrical connections and its calibration. However, there are also mechanical components inside the thermostat that can become worn over time. In these cases, a professional may need to replace the thermostat.

There are a few minor problems homeowners can often fix on their own. If the thermostat has a blank screen or doesn’t show any information, replacing the batteries may be enough to get it to work again. If this doesn’t help, check the breaker box for a tripped switch. Switching the breaker to “Off” for a few minutes can help diagnose this problem as well.

If you have a hardwired thermostat, you’ll need to remove the cover to see what wires are connected. The most common ones are R, which is the red terminal for the heater and AC, W, which is the white terminal for heat, and Y, which is the yellow terminal for compressor activity. Check that each wire is in its correct place and tightened, using a screwdriver.

You should also clean the unit occasionally to reduce dust accumulation. Older mechanical models often suffer from problems with dust, which can block the lever and contaminate the bi-metal coil. You can often disassemble the thermostat to wipe down the components with a damp cloth or compressed air. You can also clean the small metal contacts on some models by sliding a piece of paper between them.

If you can’t get your thermostat to work, it’s usually best to call a professional. A certified HVAC technician will be able to quickly diagnose the issue and offer technical solutions. They can also determine if the thermostat is the only issue or whether there are other components that need to be repaired or replaced.


Compressors are mechanical devices used to increase pressure on certain compressible fluids or gases, most commonly air. They can be as small as a fit-in-your-glovebox unit for inflating a flat tire or as large as a giant reciprocating compressor used in pipelines. Air compressors are used throughout industry to provide shop or instrument air; power tools, paint sprayers and abrasive blast equipment; phase shift refrigerants for air conditioning and refrigeration; and propel gas through pipelines.

Like any piece of machinery, it is inevitable that at some point your air compressor will need repairs. However, there are ways to keep these repairs to a minimum by keeping up with preventative maintenance routines.

Regular oil changes and filter replacements, draining the condensate traps and regularly inspecting for air leaks can go a long way in extending the life of your air compressor. Adding these items to your daily and weekly to-do lists will help prevent costly repairs down the line.

If you are experiencing frequent interruptions in production due to a failing air compressor, it is worth the effort to consider your options for repair or replacement. It may be that the cost of replacing the unit will soon pay for itself in energy savings. Your independent Kaishan distributor can help you develop a payback calculator for your specific application and facility to facilitate the decision making process.

When a compressor stops working, it is likely because the system is not building sufficient pressure. This could mean a blocked inlet air filter, faulty controls and sensors on rotary screw compressors or worn piston seals and rings in reciprocating compressors.

The first thing to try is to reset the circuit breaker that serves the compressor, if it has tripped. Then check that all plugs are in, the switch is on and there is power to the compressor.

When a compressor is not filling up, the most common cause is a ruptured air filter or clogged inlet valve. Other reasons could be a plugged or damaged drier or an air pressure regulator that needs to be cleaned or replaced.


The fan located inside the condenser unit, and the one in the blower that distributes conditioned air throughout your home, are vital parts of your HVAC system. Without them, your system will not cool your home properly. Both fans need energy to move the air, but they don’t always get that power because of issues with a capacitor or motor.

The capacitor is a small but mighty device that stores energy and provides it to the fans when needed. If you have a breaker switch that keeps flipping or is constantly tripping, the reason may be that the capacitor has burned out, which restricts the flow of power to your outdoor and indoor fans. An HVAC professional will inspect the capacitor to determine if it needs to be replaced and can make that repair quickly.

Your fan might also not be spinning because of a broken fan blade or a physical strike against another component in the system, such as a compressor. A qualified technician will inspect the fans and replace a damaged fan blade or physical strike.

Older air conditioning systems use belts to power the fans, and these are subject to general wear and tear. Loose or worn fan belts can stop the fan from spinning as it should, and an HVAC professional will replace the old belt, adjust it to specifications and lubricate other moving parts to restore full functionality.

You may also hear squealing noises coming from the blower fan, which is most often caused by a loose or worn belt that’s not producing enough power to turn the fan blades. A certified HVAC professional will replace the belt, lubricate other moving parts and adjust them to specifications to return proper airflow.

A humming sound from the blower fan might indicate that a reversing valve is defective or dirty, which could be causing the air conditioner to work inefficiently and cause your home to overheat. A licensed HVAC professional will replace the reversing valve and check the system for any other problems that might be preventing it from functioning correctly.