HVAC Resource Center

Welcome to the Five Star Heating & Cooling Resource Center. This section is concentrated on answering homeowner’s frequently asked questions, providing detailed information, how-to videos, and tips that will improve your buying decisions when it comes to your home’s HVAC system.

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Frequently Asked HVAC Questions

Top Air Conditioning Questions

Should I cover my outdoor unit in the winter?

As long as you make sure your air conditioner is not accidentally turned on by someone in your residence, covering your outdoor unit during the winter will protect it from falling ice or other issues. Coverings should not be airtight; a trash can lid secured down by bungee cords work well. However, if there’s a chance of anyone turning on the air conditioner while it’s covered, don’t do it. Turning on a covered AC could damage your condenser and its internal components. Having said that, outdoor units are designed to withstand the environment year-round and covering them isn’t really necessary.

When should I call for A/C repair?

You may start noticing issues if your air conditioning unit is nearing 10-15 years of age. If you’re experiencing any of the following, schedule repair services today.

  • The unit is blowing hot or warm air
  • The airflow is not powerful or consistent
  • You’ve found moisture and leakage around the unit.
  • Strange or unusual noises coming from the unit

Unsure of what’s wrong with your A/C  unit? Schedule a diagnostic service call today!

What is AC refrigerant?

Refrigerant is a compound typically found in either a fluid or a gaseous state. It readily absorbs heat from the environment and can provide refrigeration or air conditioning when combined with other components such as compressors and evaporators.

What does HSPF stand for?
Air conditioners that have a heat pump function are rated by what is called a Heating Seasonal Performance Factor. The more efficient units have higher HSPF ratings; it is a ratio of British Thermal Units (or BTU) heat output to watt-hours of energy consumed during the heating season.
Can I plant shrubs and/or flowers around my outdoor condensing unit?
Flowers and shrubs are acceptable around your outdoor unit. However, all plant life should be kept a few feet away from the unit to give the system plenty of room for air circulation in and out of the unit. Without this room for air circulation, the unit might overheat and cause premature problems requiring repairs. Be mindful if you have plants around the unit to remember to trim them and keep everything else out of the way.

Top Installation Questions

How do I determine the size of the unit for my home?

To determine this correctly, you should have a certified HVAC technician come to your home to take accurate measurements, especially if you are looking to replace your old equipment or purchase any new equipment. Our technicians take a variety of factors into consideration and make accurate and educated recommendations for correctly-sized equipment suitable to your needs. They look at the total square footage of your home, the number and types of windows and doors and rooms, your insulation, and even the number of people living with you to come up with an exact calculation.

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When an outdoor unit needs replaced, should the indoor unit also be replaced?

We strongly suggest replacing both the indoor and outdoor equipment at the same time, especially since the most recent EPA requirements require the phasing out of R-22 refrigerants by 2020. At this time, there aren’t any other options for replacing only one of these components without replacing the other. We should note, however, this is subject to change with gradual upgrades in current building codes and National Energy Codes being enforced, state by state. Efficiency ratings on condensers are based on the whole system being replaced.

What are efficiency ratings?
The U.S. government requires all furnace and air conditioner manufacturers to give their equipment an efficiency rating. This is a rating that applies to most household appliances. The rating gives consumers an idea of the percentage of energy used efficiently with the device or system, with the higher ratings denoting higher efficiency.
What does SEER mean?

Some types of equipment have special names for their efficiency ratings of various. As such, AC systems are rated by what is known as a Seasonal Energy Efficiency Ratio, or SEER. Like other ratings, the higher the SEER rating, the more efficient the system. Today, any new AC equipment must at least meet a 13.0 SEER rating. Nevertheless, a lot of manufacturers nowadays have equipment that rates as high as 21.0 SEER.

What does AFUE mean?
All gas furnaces are rated by their Annual Fuel Utilization Efficiency, which is what AFUE stands for. The better the AFUE rating, the more efficient the unit. Natural draft furnaces and boilers usually have an 80 percent efficiency rating. Manufacturers, such as Lennox, have even more efficient furnaces that operate as high as 98-percent; this means 98 percent of the energy you are using for your furnace is being used to heat your home, which is pretty good!
What is the difference between a package unit and a split system?
Package units have all the required components, both indoor and outdoor, inside it. A package unit is usually used in commercial properties, apartments and condominiums. Split systems use an indoor air handler/coil or furnace/coil along with an outdoor condenser unit to provide a fully complete comfort system for the home.

Top Indoor Air Quality Questions

Should I set my thermostat to “on” or “auto?”
If you set your thermostat to auto, the fan runs only when the temperature requires it. This is the most effective and most used setting. Nevertheless, there are benefits to using the “on” setting. Because the air is always filtered through the unit’s air filter, and continuously circulating air leads to a more even temperature throughout the home, a lot of new furnaces are equipped with fan motors that enable this function.
What are the different types of pollutants?

Here are examples of common indoor air contaminants and their main sources:

  • Carbon dioxide (CO2), tobacco smoke, perfume, body odors – from building occupants.
  • Dust, fiberglass, asbestos, gases, including formaldehyde – from building materials.
  • Toxic vapors, volatile organic compounds (VOCs) – from workplace cleaners, solvents, pesticides, disinfectants, glues.
  • Gases, vapors, odors – off-gas emissions from furniture, carpets, and paints.
  • Dust mites – from carpets, fabric, foam chair cushions.
  • Microbial contaminants, fungi, molds, bacteria – from damp areas, stagnant water, and condensate pans.
  • Ozone – from photocopiers, electric motors, electrostatic air cleaners.
How do I know if I have poor Indoor Air Quality?

It is common for people with poor Indoor Air Quality to report one or more of the following symptoms: dryness and irritation of the eyes, nose, throat, and skin, headaches, fatigue, shortness of breath, hypersensitivity, and allergies, sinus congestion, nausea

People generally notice their symptoms after several hours at work and feel better after they have left the building or when they have been away from the building for a weekend or a vacation.

If your home has green or black moldy spots (generally in moist areas), dust, pet dander, etc., it’s likely that you’re experiencing poor levels of air quality. We suggest trying our Indoor Air Quality products and services such as humidifier installation, duct cleaning, thermostat upgrades, and more.

Which Indoor Air Quality products could improve my allergies?

It depends on what you’re allergic to. If dust, pet dander, or certain chemical fumes bother you, an air cleaner and purifier can remove up to 95% of the particles that cause your sniffling, sneezing, and watery eyes.

If you’re sensitive to microorganisms like mold or pollen, add UV lamps. When ultraviolet lights are installed in your HVAC system, they emit an electrical charge that kills these tiny nuisances instead of allowing them to grow and recirculate through your home. UV lights also kill bacteria and viruses that cause colds, flues, infections, and other illnesses, so they are a great option for any home.

View all Indoor Air Quality services →