HVAC Can Be Easy With This Guide
If the thought of an HVAC failure leaves you scratching your head wondering what you would do during such an event, you are not alone. The key to knowing how to handle such events is spending some time learning how to hire the best possible professionals. The information found below can serve as just the resource you need.
When you have an outdoor unit, be sure to keep all plants, flowers, shrubs and trees at least two feet from it. Anything that grows inside it, either above the ground or even roots beneath the soil, can block it up and cause it to break. Give it some breathing room.
Be sure to get every quote or estimate in written form. You have no recourse on a verbal agreement, so a written contract is a must. This will allow you to follow up if something goes wrong or you don't get what you were promised, protecting you from shady contractors.
Before you hire anyone to do any work on your HVAC, be sure to get a written estimate which has itemized costs listed on it. This will ensure that comparing one contractor to another will be simple as you can see what one offers that another doesn't, or what price they're charging for the same items.
Clean the condenser on your debris regularly. Leaves and debris can accumulate quickly, particularly following storms, and that can cause problems for your system. It can cause your system to malfunction by overheating.
To cut energy costs, you should service your cooling and heating system once a year at least. During a maintenance visit, professionals can help by inspecting the system's motor, oil the different moving parts as well as check the system's freon levels. This ensures your system runs smoothly.
Clean your filters! If you have a window unit air conditioner, there will be website a filter right under the grill you can vacuum. If you have a furnace or outdoor units, they will also have filters to be cleaned or replace. A dirty filter can make your unit inefficient or even let it overheat.
If you want your energy costs to go down, have the heating an cooling system you own serviced every year at least. When they visit to service the unit they're going to inspect the motors, oil the parts that move, and see how much freon is in your system. These simple things will keep your system running at peak performance.
Try to stay away from HVAC contractors that ask for upfront payments before they are willing to get started on the work they were hired to do. In many cases, this means that they are more concerned about getting paid than they are about making sure the job is done well.
Make sure things don't get too hot or cold where your thermostat is. Any electronics or heat sources like lamps or televisions nearby can trick the thermostat into thinking the home is warmer than it actually is. This just means it runs your air conditioning longer than necessary, wasting energy and money.
Keeping your home's HVAC system working properly is a must if you want to avoid extremes of heat and cold. However, sorting through all of the different options that are available to you can be tricky. Let the information that you have read here guide your next purchase of an HVAC system.
Can the AC filter in your home, office or local mall protect you from Covid-19?
When New York Governor Andrew Cuomo announced last week that malls in New York could not reopen until they installed high-efficiency particulate air filters capable of trapping the virus that causes Covid-19, Harvard environmental health researcher Joseph Gardner Allen was thrilled.
"I've been writing consistently since early February about how healthy buildings should be the first line of defense against the novel coronavirus," said Allen, who directs the Healthy Buildings program at the Harvard T.H. Chan School of Public Health.
"I'm really grateful that we have a leader in the country -- somewhere -- who was finally talking about healthy buildings, ventilation and filtration," Allen said. "That hasn't happened before. It just hasn't happened."
A push to action
Allen was one of 239 scientists who wrote an open letter to the World Health Organization, the US Centers for Disease Control and Prevention and other health agencies, asking for a change in their guidance to the public on how the novel coronavirus, or SARS-CoV-2, can spread.
Current guidance only focuses on "hand washing, maintaining social distancing, and droplet precautions," according to the letter, published Monday in the journal Clinical Infectious Diseases.
The health agencies are ignoring the tiny droplets of virus that sputter and spray from our mouths, become aerosolized and then float away into the air, the scientists said, as a likely means of transmission.
"They don't want to talk about airborne transmission because that is going to make people afraid," co-author Donald Milton, a professor of environmental health at the University of Maryland, told CNN in a prior interview.
"The best vaccine against fear is knowledge and empowering people to take care of themselves," Milton said. "Why wearing a mask is important is because it blocks the aerosols at their source, when it is easy to block them."
MERV ratings
In his edict to New York mall owners, Cuomo was talking about HEPA filters, which have the highest MERV ratings, between 17 and 20.
What's MERV? It stands for "minimum efficiency reporting value," and it's how filters are rated in their ability to trap tiny particles. The MERV ratings go from one to 20: Filters with higher MERV ratings are more effective than filters with lower ratings.
At the highest end, HEPA filters are used by hospitals to create sterile rooms for surgeries and to control infectious diseases, and are able to remove 99.97% of dust, pollen, mold, bacteria and other airborne particles with a size as small as 0.3 microns. For comparison, Covid-19 is thought to be between 0.06 to 1.4 microns.
"Filters are rated at their worst performance, so 99.97% is the worst it will do," Allen said. "And that's rated for a particle size of 0.3 microns, but smaller and larger it actually does better. So the point is that it's capturing nearly all particles."
Unfortunately, most businesses and home owners may find it difficult to retrofit their existing system to accommodate a HEPA filter, or any filter higher than the rating recommended by the system's manufacturer.
Doing so can actually impair the system's performance: Smaller pores in HEPA air filters make it more difficult for it to push air. Using denser filters can affect the efficiency of the unit and strain the fan, while decreasing indoor air quality -- the opposite of what you desire.
"HEPA filtration is not always going to be feasible or practical," Allen said. "But there are other filters that can do the job. What is recommended now by the standard setting body for HVAC is a MERV 13 filter."
High-efficiency filters in the 13-to-16 MERV range are often used in hospitals, nursing homes, research labs and other places where filtration is important.
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