Carney Plumbing, Heating & Air Conditioning Blog

AC As a Safety Feature in the Home: A Tip From Horsham

August 22nd, 2011

Ask a hundred people in Horsham what the primary role of air conditioning is and I’ll bet you they say “comfort”. We seek out AC to stay cool and beat the summer heat, but did you know your air conditioning is a lot more than just a convenience – it is a safety feature in the midst of heavy heat waves.

Heat Is More than Just Uncomfortable

We tend to think of heat as an uncomfortable inconvenience. In reality, it is quite dangerous. According to the Center for Disease Control, heat waves killed 8,015 people between 1979-2003, more than hurricanes, tornadoes, lightning, earthquakes and floods combined in that time period.

Why is heat illness so dangerous? It comes on quickly and it’s easy to ignore the warning signs, especially when you are already uncomfortable. While hydration is important, the real risk occurs after you’ve become dehydrated – when your body can no longer keep itself cool. This is known as heat stroke and can lead to a number of life threatening conditions, especially for the elderly, infants and those with chronic conditions.

That’s where air conditioning comes in. On the CDC’s extreme heat preparedness webpage, air conditioning is listed as the number one preventative factor against heat related illness. Simply put – if you have an air conditioner, there is a much smaller chance you will get sick from the heat. Dehydration happens less frequently when you’re in an air conditioned environment, meaning that your body can regulate temperature internally and you feel comfortable – not a bad deal for a simple installation.

Staying Cool Is a Medical Necessity

Heat is more than just a direct threat. It addles the mind and makes your reaction times slower. In effect, by allowing your body to overheat, you put yourself at risk. Simple tasks like climbing a ladder or taking out the trash could result in an injury because you don’t have the energy or the mental clarity to perform them as you would on a normal day.

So, air conditioning is about a lot more than just staying comfortable – it’s a health issue. Especially if you have small children or elderly adults in the house or if anyone in your family has a medical condition like obesity, heart disease, mental illness, poor circulation, an air conditioning system is an absolute must during heat waves. If you need more information about how to keep your home cool, contact your AC contractor.

How to Calculate Duct Size for an AC System

August 19th, 2011

Duct sizing for air conditioning is a complex process using one of three methodologies. The goal of duct sizing is to provide the perfect space through which heated and cooled air can travel around your Conshohocken home. Ducts should provide ample air flow to keep you comfortable without overworking your HVAC system or costing you an arm and a leg on your energy bill.

Methods Used for Sizing

There are three methods used for most modern duct sizing. The first is the Velocity Method. The velocity method takes into account the speed at which air flows through the ducts based on their general size. A series of equations is used to determine this, including duct cross sectional area, air flow rate and air speed. A much more detailed breakdown is available on the EngineeringToolbox.com for those interested in the math behind the process.

In general though, the velocity method allows contractors to determine the appropriate size and layout of ducts based on their application (residential, commercial, industrial or high speed) and their position (main or branch ducts).

Contractors may also use the Constant Pressure Loss and Static Pressure Recovery methods to design ductwork for your HVAC system. The constant pressure loss method tends to result in more components but provides a more accurate reading of the actual pressure loss in the system based on the materials used and the layout of your ductwork.

Static pressure recovery focuses on ensuring the same pressure level is achieved at all vents and inlets for the system. It is probably the most complicated sizing method, however, so it is rarely used for residential installations.

Simplifying the Process

Were we to break down the process into its core components, this is what a contractor would do when sizing your duct work:

Determine CFM for Each Room – using the Manual J for load calculations, they would determine the CFM. This is based on the (Room Load/House Load) x Equipment CFM. The entire house must be measured and load calculations completed before this can be done.
Friction Loss Rate – Friction loss rate is the (Available Static Pressure x100 / Effective Length).
Duct Sizing – Finally, the contractor will use a chart or software to select ductwork based on the friction loss and CFM calculated in the first two steps.

The goal of all of this math is to ensure that the system installed is exactly as large as is necessary to distribute heated or cooled air to the entire house. Incorrect measurements result in improper delivery of that air and a system that doesn’t quite get the job done.

Will My Air Conditioning Work Better with Dehumidification

August 17th, 2011

There are a number of common misconceptions, in Blue Bell and everywhere else, about humidity and air conditioning and how one affects the other. In truth, humidity is a major part of the discomfort we feel when the mercury rises. It can be 78 degrees outside but feel miserable simply because the humidity is high. So, many people wonder whether a dehumidifier is a good solution to moderate heat and how it will work in tandem with an air conditioner.

Humidity and Your Air Conditioner

First, remember that air conditioning naturally lowers humidity because it cycles air through its condenser and evaporator coil. Conditioned air is naturally lower in humidity, regardless of what’s going on outside. So, if it is hot outside and humid, an air conditioner alone is very effective. On the other hand, a dehumidifier is useful is when the temperature isn’t that high but the humidity is.

Dehumidification not only lowers the relative humidity in your home, it reduces the need for cooling because you will feel more comfortable. Not only that, but a dehumidifier costs significantly less to run. So, when the temperature outside isn’t that high, there is no need to use thousands of watts per day of electricity just to stay comfortable.

This also reduces the overall wear on your air conditioner. Since it doesn’t need to run 24 hours a day to reduce humidity, wear and tear on the device is reduced and you save a tremendous amount of money on repairs and eventual replacement costs.

When to Use a Dehumidifier Alone

Generally, the Department of Energy recommends setting your air conditioner to 78 degrees and using a combination of a dehumidifier and fans to stay cool while it is off. If the temperature rises above that level, the air conditioner will turn on and supplement your dehumidifier. Consider too that a dehumidifier will reduce the burden placed on your air conditioner to pull humidity from the air. Humid air takes more energy to cool than dry air. Despite the fact that dehumidifiers will often raise the air temperature by 1-2 degrees, they save energy and make you more comfortable.

So, if you’re looking for a way to reduce your energy bill, improve your indoor air quality, and enhance the longevity of your air conditioner, look no further than a quality dehumidifier.

When Should You Check Your AC Filters: A Tip From Chalfont

August 15th, 2011

The filters on your air conditioning unit in your Chalfont home are vital for keeping out the dust and debris that make things like illness, allergies and air quality worse. And it’s important that you take personal responsibility for checking those filters. Sure, you have a professional visit your home once a year to check the air conditioning, but you should also check the system yourself on a semi-regular basis for possible filter degradation.

Monthly Checks

So, how often should you check? Think of it this way. There is no such thing as checking too much, but you can easily not check often enough. So, we recommend checking your filter at least once every 4 weeks. It may not always need to be changed during that four week checkup (sometimes it can last 6 weeks or longer), but it’s good to take a peek.

Why is this so important? Because filters that haven’t been checked and changed as needed have a habit of building up excess sediment and debris. Not a problem when it comes to actually working, but a huge problem when it comes to your energy bill. The harder a system has to work to keep you house cool, the more energy it draws and the more you pay to have cool air in your home. And it will break down much faster as a result of overwork and dirty filters.

Changing an AC Filter

If your filter is ready for a swap, here are some quick tips to get the job done:

Find Your Filters – If you don’t know where your filters are, ask your contractor on the next visit or look near the return grills by the thermostat.
Remove the Filters – Open the latches and pull the old filter out to check it. You should be able to see clearly through a permanent filter and a disposable one should still be white. If this isn’t the case, it’s time for a cleaning/replacement.
Clean the Area – Clear the grill and area of any debris and sediment that might make the filter worse after replacement.

Proper filter maintenance only takes five minutes and it will save you money every month you run your AC – not a bad deal for a few minutes’ work.

Is Geothermal Right for My Home?

August 12th, 2011

Geothermal heating is a great alternative to other types of home heating systems in Lansdale. It is safe and efficient, costs very little to operate and makes use of a great renewable resource right below our feet. But is it right for you? Well, geothermal heating may be the right choice for many people, but there are many things to take into account before you can determine whether or not it is the best choice for your home.

The first important thing to understand when you are trying to decide whether or not to go with geothermal heating is how one of these systems actually works. A geothermal system heats your home by extracting heat from the ground and then transferring that heat into your indoor air. This happens when liquid, usually water or antifreeze, passes through a loop of pipes installed several feet below the ground.

The liquid absorbs heat from the ground, which in the winter is always warmer than the air, and carries is back up to an air handler inside your home where that heat is allowed to disperse into the air. Once the air is heated, the air handler blows the air through a system of ducts throughout your house, providing a constant stream of heated air to all areas of your home. The liquid, on the other hand, simply cycles back through the ground loop to pick up more heat and repeat the same cycle over again.

Because a geothermal heating system does not actually generate heat, it requires very little energy to operate. This means that it is both very cheap for you to run and environmentally friendly. But since installing a geothermal heating system involves putting pipes in underground, it can be pretty expensive initially. However, as long as the amount you save every month on your heating costs is enough to offset the high initial price of installation, it is worth it to put down the money up front.

Another alternative, of course, is a more traditional air source heat pump. These are much cheaper to install and nearly as cheap to run. However, air source heat pumps are not as efficient when the air temperature gets below freezing as a geothermal system can be. If you live in an area with harsh winters, the geothermal heat pump is a better option than an air source unit.

The Energy Efficiency Rating of Central Air Conditioners: What Is it and Why Is it Important? A Tip From Green Lane

August 10th, 2011

When you are shopping for a central air conditioning system in Green Lane, you will have to evaluate your options based on a number of different factors. For instance, you will need to decide which type of system is the best match for your home and for your particular cooling needs. It is also important to make sure that the central air conditioner you choose is the right size for the cooling load it will have to take on.

However, it is also very important to evaluate your central air conditioning options based on how energy efficient they are. This will have a great deal to do with how much you pay in terms of cooling costs each month, which makes it easy to see why you should take it into account before you make a purchase.

The energy efficiency of a central air conditioner is generally expressed as a seasonal energy efficiency rating, or SEER. The SEER numbers you will typically find on the latest air conditioning systems range from eight to 19.5 with the higher numbers signifying a more energy efficient model.

So it is pretty easy to figure out that a central air conditioner with a higher SEER will save you some money monthly because it will use less energy to get the same job done. But central air conditioners with high SEERs also typically have high price tags. So to determine how high of a SEER you need, you will need to know more exactly how much more money you will save as you move up in the rankings.

You can do this by comparing the SEER of the system you currently use with the new system you are considering and compare how much your current energy usage would cost you with each model. Basically, you want to pick a central air conditioner that will save you enough to offset the purchase price of the unit.

Often, this means that you will be best off with a SEER 14 or SEER 16 because these units save you a considerable amount over older models without carrying too high a purchase price. However, the amount you save will be directly related to how much you use your central air conditioning system, so if you live someplace that is extremely hot for a large chunk of the year, it may be worth it for you to buy a very high efficiency air conditioning system.

If you want more information about which type of air conditioner is right for you, contact your local HVAC professional.

Warning Signs: When to Call for an Air Conditioning Service

August 8th, 2011

The last thing you want is to be without an air conditioner during the hottest days of the year, especially in Elkins Park. Ideally you would never have to call for service to repair your air conditioning system, but just like anything else, your air conditioner will break down once in a while. However, you can dramatically reduce the inconvenience and cost of emergency air conditioning repairs if you are able to spot the warning signs of a problem before it shuts down your system completely.

For instance, all air conditioners make noise, but if your air conditioning system is suddenly making much more noise than it used to, chances are that something in there is not working properly. Calling for repairs when you notice this sudden increase in noise from your system will greatly increase the chances that the repair will be relatively minor and that you will not have to go without air conditioning when you need it most.

Also, it is a good idea to call for service if your air conditioning system does not seem to be doing as good a job as it used to when it comes to cooling your home evenly and effectively. Uneven cooling is a good sign that something is not working right within your system. And even if your air conditioner continues to work, it will probably be using up more energy than necessary for a less than ideal end result.

Along these same lines, a noticeable increase in humidity in all or part of your home is another good indication that something is wrong with your air conditioning system. Air conditioners both cool and dehumidify the air, so if yours stops removing humidity properly, you need to find out why.

In fact, even if you do not notice any difference in the way that your air conditioner is performing, you can still spot a problem if you keep a close eye on your energy bill. If you see a sudden increase in the amount of your bill because of the amount of energy that your air conditioning system is using, it is a good sign that something is not working right.

It may be tempting to put off calling for repairs, particularly if your air conditioner is still able to keep your house comfortable. However, it will likely be much cheaper and more convenient to have the repairs done early rather than waiting until the unit breaks down entirely.

What Is the Energy Star Label?

August 5th, 2011

Any time you go out and buy any type of appliance in Norristown, you probably notice that some have a distinct mark that signifies them as Energy Star appliances. That sounds like a good thing, of course, but what does it actually mean? Should you always buy an Energy Star model over another type?

The Energy Star label was originally developed to help consumers more easily recognize appliances that are more energy efficient than the average. In order to obtain an Energy Star seal of approval, any device must meet very strict guidelines when it comes to energy efficiency.

What that translates into for you as a consumer is a lower monthly energy bill when you buy Energy Star appliances. Of course, once they have obtained an Energy Star labels, manufacturers can charge whatever they want for their product, and it is not unusual to pay more for a model that is certified an Energy Star.

However, as long as the potential savings over time that you will get by using the Energy Star model as opposed to one that is not as energy efficient outweigh the difference in initial purchase price, it is worth it to spend a bit more on the Energy Star model.

Keep in mind, though, that just because a produce meets the Energy Star guidelines for energy efficiency does not necessarily mean that it is a superior product in terms of quality or overall effectiveness. Plus, not all Energy Star appliances are created equal. You should still do your research and pick out the product that will both save you the most money and has the best chance of getting the job done right.

Another benefit to Energy Star products is that, because they use less energy when they run, they also have a smaller impact on the environment than a model that uses a greater amount of energy to perform the same tasks.

Overall, it is definitely worth taking a closer look at all of the Energy Star options out there when you are purchasing an air conditioning system or any other type of appliance. Using less energy is always a good thing both for your bank account and for the planet. But you also want to make sure you are actually getting the best product for your money. Ask your local professional about other energy saving options.

Why You Cannot Neglect AC Maintenance: A Tip From Hatboro

August 3rd, 2011

Especially if you have just purchased a new air conditioning system (as I did in my home in Hatboro) maintenance is probably the last thing you are thinking about. In fact, if you are like most people, you do not think about your air conditioning system at all until it does not work when you need it. But if you simply continue to use your air conditioning system without maintaining it, you will be setting yourself up for a lot of problems later on.

Just like your car or any other machine that you run on a regular basis, your air conditioning system requires a regular tune up to keep it running like it is supposed to. The type of air conditioning system you have will dictate exactly how often this maintenance service needs to take place, but most systems benefit greatly from having a tune up once a year.

When you have just purchased an air conditioning system, the last thing you probably want to do is shell out a bunch of extra cash when the system is still running fine. But it really is much cheaper to pay now rather than waiting until you have a problem with your air conditioner to call for service.

During a regular maintenance visit, your technician will examine all of the component parts of your air conditioning system to make sure that they are working the way they should and not showing any signs of excess wear and tear. This is a great way to detect problems early, even when they have not yet begun to show in the air conditioner’s performance.

Your air conditioning technician will also thoroughly clean out your system to ensure that no excess debris is allowed to build up around the coil or other vital parts of the air conditioner. This is important because it helps the air conditioner to continue to function at peak energy efficiency levels. Without regular maintenance, your air conditioner will gradually lose efficiency over time. It will only lose a little bit every year, but if you do not do something to stop it, those little bits will quickly add up.

Regular maintenance also helps to prevent more costly and inconvenient repair visits later on. And it will certainly help to increase the lifespan of your air conditioner as well. Whether you have just purchased an air conditioning system or have had yours for several years, it is never too late to start your annual maintenance visits.

When to Replace Your Air Conditioning System

August 1st, 2011

One of the last things you probably want to think about is replacing your current air conditioning system, especially during a hot summer in Telford. However, the time will come when you can no longer ignore the fact that your air conditioning system is not getting the job done like it used to. And considering your replacement options early can help save you a lot of money and aggravation in the long run.

Before you can start looking at replacement options, though, you need to be aware that the time has come to replace your current model. But how can you tell that your air conditioner is on its way out? Well, there are actually quite a few warning signs that, if you are attuned to them, will help you determine whether or not it is the right time to replace.

First of all, if you have to call for repairs, even minor ones, on a regular basis, chances are that you would be better off replacing rather than continuing to patch up the air conditioning system you already have. This is true for several reasons including the fact that a system that requires repairs so often is probably not going to last you much longer anyway.

By replacing now rather than continuing to pay for repairs, you will save a lot of money in the long run. After all, you are going have to pay for the new system sooner or later, so you might as well skip the shelling out of extra cash to repair a system you are just going to get rid of anyway.

Problems like inadequate or uneven cooling or mismanaged humidity levels in your home are a good sign that something is not working right in your air conditioning system and that it may be time to replace. At the very least, you should call someone out to take a look and let you know what type of repairs you are looking at.

You should also think about replacing an older system even if it is still working fine because the newer systems available are much more energy efficient than even the top of the line models available ten years ago. While you will have to pay the purchase and installation cost up front, you will immediately begin to save substantial amounts on your monthly cooling bills.