The Unintended Consequences of Closing Vents

The Unintended Consequences of Closing Vents

It sounds like a great idea. One that you feel extra smart and special for thinking of. You’re not the only one, so many people have the brilliant idea that if they close a vent in a room you don’t use that often, you can redirect that heating or cooling into the rooms you inhabit more frequently. It makes sense in theory, however many older heating and cooling systems are not set up to support the significant pressure changes that closing particular vents could end up causing.


Air pressure changes in your duct system is the initial and most impactful consequence of closing individual vents. This can lead to some unforeseen problems that you might need to address. The first problem you may encounter is increased duct leakage. When you close the vents, especially if it’s multiple vents, you change the air pressure in your system, which could in turn, expose some of the weaker areas in your internal duct system. It’s good to know where these leaks are, however, it’s not a weakness you want to exploit.


This leads to our next issue with closing vents, which is: overworking the system. Older blowers have a fixed speed for the air pump. So, without a computer telling the pump that a vent is closed, it’s going to keep pushing the air at the same rate it always has. But this system was likely given a certain pressure to adhere to based on the number of vents, and the size of your house. Older systems are set to maintain a particular air pressure to make sure it always has enough “umph” to make it through your entire home. Closing random vents throughout the house will affect this equation.


This problem can cause our next and worst inevitability, which is the potential for a cracked heat exchanger. With the increased pressure, leading to the air pump having to push harder to maintain the same air flow – this could lead to a very dangerous outcome. A cracked heat exchanger has the potential of allowing the leak of the deadly gas, carbon monoxide. This is not a machine you want to become damaged in your home. It’s completely fixable (call us)! But if you are unaware of the damage, the consequences could be catastrophic.


There are numerous problems that can arise from closing vents in your home, too many, if we’re being honest. You could also end up having no issues at all! But it’s not worth the risk in our BOLD opinion. If you have any questions, or would like a system inspection – call Bold City Heating & Air at (904) 379-1648 and we would be happy to help


Here’s the “Bold” Guide to Carbon Monoxide

Carbon Monoxide (CO) is extremely difficult to detect. This odorless, colorless, toxic flammable gas has been dubbed the “silent killer” due to the fact that if there’s a leak, it is undetectable by our five senses. Due to the fact that CO is used in most household appliances including air and water heaters, as well as gas stoves and fireplaces, the prevalence of this gas in homes poses a real threat at all times. According to the Center for Disease Control (CDC), During 2010–2015, a total of 2,244 deaths resulted from unintentional carbon monoxide poisoning, with the highest numbers of deaths each year occurring in winter months.

We at Bold City Heating and Air believe it is our privilege and responsibility to keep our friends and clients as safe as possible, so here are some tips to help prevent carbon monoxide poisoning in your own home.

Install CO detectors in your home

Florida statute requires that Carbon Monoxide detectors be installed in any home or addition built after 2008. So more than likely, you should already have them, but if not, please go out and purchase a couple right away. The law states they should be installed within 10 feet of each room used for sleeping purposes a good rule of thumb is to replace batteries every six months (Spring forward, fall back, change batteries) to make sure they remain operable.

Check your HVAC vents for proper air flow

It may be tempting to close some air vents around the house to save money, thinking that if the air is blocked, you’ll use less energy. Well, unfortunately that is not the case. In order for your system to work properly, you need to make sure all vents are open and unobstructed. Not only can a blocked vent actually drive the cost of your heating and air up, but it can also cause your furnace to over work and inevitably, overheat. This can lead to a cracked heat exchanger, which could allow Carbon Monoxide to leak into your home. So, long story short, keep all the vents open people.

Schedule regular maintenance

The best way to ensure your system is working properly, and in order to prevent any leaks or mishaps, it’s a good idea to schedule regular system maintenance every year by a professional, or better yet, call the experts at Bold City Heating & Air and we will get you set up right! Give us a call at 904.299.8684 and experience the BOLD difference.

No matter which system you use, the primary benefits of a smart thermostat is the ability to save money and preserve energy efficiency for your household. And here’s an industry tip, in order to get the most out of your smart thermostat, give Bold City Heating & Air a call at 904.299.8684 and we will perform a system inspection to make sure your home is running as efficiently as possible.


Carbon Monoxide data sourced from:

Florida Statute information:

Smart Thermostats

Smart thermostats are the way of the future, and bring with them a multitude of benefits from saving you money to ease of use. Over time, they can become your personal temperature assistants, learning your habits and anticipating your needs!

Here are some benefits of upgrading your home system to using a smart thermostat.

It’s Easy

They say change isn’t always easy, but in this case, they’re wrong. Installation is a breeze, and most systems come with an accompanying app to help you seamlessly transition to efficiency. Contrary to what you might think, if you’re feeling intimidated, most smart thermostats install just like your old one did. You simply pop off your old thermostat, and plug in your new one, most installations should take less than 30 minutes. Then you’re off to the races in savings!

Fast Learners

No matter which system you choose, they all have the same basic abilities to learn your habits and self-adjust after a period of time. By intelligently monitoring your use, they can learn when you wake up in the morning, and at what temperature you like to sleep. The apps that accompany these devices can follow your phone to know when you’re out of the house. With this knowledge, the thermostat can then self-adjust to a more energy efficient temperature when you and your family are out of the house. Whether we like it or not, humans are creatures of habit, but with smart thermostats, that can turn into increased efficiency and comfort.

Money Saver

After the initial investment, smart thermostats are designed to save you money, and lots of it. Some systems boast an average savings of 10% to 12% on heating bills and 15% on cooling bills after only two years of use. Because these devices have the ability to learn your routines, they quickly adapt to life as you know it, they become an active member of the household, adjusting the temperatures for you based on how you like it! Along with the ability to make adjustments remotely, as well as track your usage, energy efficiency and progress, you’ll notice the ease and comfort, but you’ll love the savings!

No matter which system you use, the primary benefits of a smart thermostat is the ability to save money and preserve energy efficiency for your household. And here’s an industry tip, in order to get the most out of your smart thermostat, give Bold City Heating & Air a call at 904.299.8684 and we will perform a system inspection to make sure your home is running as efficiently as possible.

What’s All The Noise?: When Your Outdoor Unit Is Making A Racket

There’s nothing quite like the sounds of the season: jingling bells, children’s laughter, Christmas music, popcorn popping, and… an indiscernible outdoor noise? Wait, is that your HVAC unit? If it is, we’ll be upfront in saying that you’ll probably need a professional to come to check it out. However, in narrowing down the probable causes of your unit’s racket, it’s all about narrowing down what it is, exactly, that you’re hearing.

For example, if you hear buzzing, you might be tempted to let it slide, depending on how quiet it is. However, if the buzzing is persistent regardless as to whether or not the unit is running, you likely have an electrical problem on your hands. From faulty relay switches to an inefficient connection of parts to a problem with the condenser fan motor, it could be one of many electrical issues.

If you hear screeching, however, you likely will be looking at necessary repairs to or a replacement of fan motor parts, such as the bearings. A similar noise, such as screeching or a whistling noise, though, means a different problem entirely. Particularly if it persists for several minutes after you turn your unit on, there’s probably a build up of high refrigerant pressure, which could be dangerous or even cause your unit to turn on and off repeatedly on its own.

Finally, if you hear any slamming or knocking noises, it could either be that the internal fan is being obstructed or that the springs have been damaged and are now faulty. If the noise is only occurring when your unit is being turned on or off, it’s probably the springs. If you hear knocking while your HVAC is running, however, then the fan has probably come loose and is now banging around.

In any case, as stated before, you’ll always want to reach out to professionals you trust in order to properly diagnose and fix the source of the loud noises. And Bold City Heating and Air is ready and waiting to help you figure the mystery out! We’re a locally owned and trusted Jacksonville company, so call us today to schedule an inspection and experience the bold difference!

Not All Air Filters Are Created Equal

Did you know that you have options now when it comes to choosing an air filter. This is not a ‘one size fits all’ scenario anymore. You have options to choose from that can impact the air quality in your home, and we’ve done the research for you to help decide which is best for you and your home.

According to Consumer Reports, some essential terms you should know when shopping for air filters are as follows:


This is the Micro-Particle Performance Rating developed by 3M. It rates the filters on the ability to capture airborne particles smaller than 1 micron. The best filters have MPRs between 1500 and 1900.


Home Depot uses its own rating system on a scale of 1 to 10 called the Filter Performance Rating. The higher the number the better it filters.

Now, when it comes to choosing a specific filter for your house, you have a variety to choose from. Here is a list of some available options, along with their individual benefits.

BASIC/GOOD (MPR 100, FPR 4-5) air filters will likely capture the most common air contaminants such as pollen, dander, dust and dust mites. These are the most affordable and minimal of the filtration options. If allergens or odor are not a concern – this could be a sufficient solution for your home.

The next step would likely be a “better” or “clean air” type filter that has an MPR of 300-600 or an FPR of 6-7. These filters are just a step above the basic, however this will also trap mold, which is a common household occurrence and a major allergen for many.

For added coverage, upgrade to a more substantial filter specifically designed for allergen filtration (MPR 800-1200, FPR 8-9). These filters have the ability to clean the air as it passes through the filters, eliminating most key allergens such as smoke, mold, pollen, pet dander, and other microscopic elements that tend to float through the air.

The top teared filters (MPR 1200+, FPR 10-12) are your best chance at complete air cleaning technology. If you are looking for a filter that can do it all, these are your best bet. Not only do filters in this range clean the air, ridding your home of dust, mold, mildew, smoke, smog, bacteria, and pet dander, but they also have the ability to eliminate all household odors and airborne viruses as well.

If you have any questions or concerns about your air quality and which filters might be best for your home, give Bold City Heating and Air a call at (904) 379-1648.