Atlanta Air Conditioning Guide: Common Issues with AC Replacement

Monday, August 20th, 2012

When you are replacing your Atlanta air conditioning system, it is imperative to have the right air conditioning company complete the project. The Atlanta AC specialists at Cool Air Mechanical are here to provide some great information on the most common issues with AC replacement.

Leakage in Return or Supply Ducts

Duct leakage is one of the leading causes of inefficiency in any new air conditioning system.

  • Return duct leakage decreases indoor air quality. Air from unused spaces, attics and crawlspaces mixes with the air in the ducts, potentially causing clogs in coils and the blower wheel which further decrease efficiency.
  • Supply duct leakage pushes air into unused spaces. This increases the AC run time, causing you to pay more for the same amount of cooling capacity.

When ductwork is properly installed and sealed it boosts energy-efficiency by as much as 15% to 20%, provides better air flow and a significant reduction in air contaminants.

Undersized Ductwork

Having a proper amount of air flow through ducts is imperative to overall AC performance.  When ducts are not large enough they restrict air flow, causing air conditioners to lose their full capacity of cooling. This leads to hot and cold spots.

Restrictive Registers and Return Grills

When return grills and registers are too small or an inadequate air filter is used it can decrease air flow. This reduces your air conditioning efficiency.  Proper sizing of return grills and registers as well as quality air filters will ensure the AC is gets the right amount of air.

Insufficient Refrigerant Charge

A low refrigerant charge can negatively affect AC performance by as much as 20%.  With the proper refrigerant charge an AC system should operate efficiently.

AC Sizing

Oversized AC equipment will cool a space but it cannot do so efficiently.  Undersized air conditioning systems will not properly cool an indoor space and will run almost continually to get the job done, causing higher energy costs.  With proper AC sizing your equipment will work efficiently.

Cool Air Mechanical can perform your Atlanta AC replacement correctly, ensuring that you never have to worry about these common issues. Call us today to learn more!

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Marietta Air Conditioning Question: Repair or Replace My Central AC?

Monday, July 23rd, 2012

It’s the big question with all major possessions: at what point does it make more sense to replace it than repair it yet again? Every day, consumers face this dilemma with their automobiles, computers and yes, their Marietta central air conditioners.

Unfortunately, there is no hard and fast answer to the question. It all depends on the situation at hand. But in this brief guide, we will outline some general guidelines for replacing an air conditioner, rather than repairing it again. Hopefully that will help you make a decision when the time comes.

When to Replace

Generally speaking, you should seriously consider replacing your central AC when one of these conditions arises:

  • Repair bills are too frequent

If you are having to call a repairman out once a month to fix some issue with the AC, that’s too much and it is time to get a new one. Gather all your past repair invoices together. Look at how frequent they are and how much they cost. That will help you analyze whether a new system is worth it.

  • Energy bills are too high

A struggling AC will be less energy efficient, resulting in rising energy costs. Again, gather up your past electric bills. Are they steadily going up? Are you paying more on average per month than you were a year ago? May be time for a new AC.

  • AC is not performing well, even with maintenance and repair

If you notice that even after being fixed, and with usual maintenance, that your central AC is just not working as well as it used to, then it may be on its way out.

  • House is too humid

Air conditioners are supposed to remove humidity, so if yours is not, that is a problem. It could be a sign that the system was the wrong size to begin with, and the only real way to fix that is to replace it with one of the correct capacity.

  • Some rooms are too hot, while others are too cool

Uneven cooling usually means an air conditioner is on its last legs.

Other than these situations, you are generally better off making the necessary repairs. Each situation is different, though, so consult with a Marietta  air conditioning professional like Cool Air Mechanical on the particulars of your system before making a decision.

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Atlanta Air Conditioning Guide: Retrofitting Air Handlers for New Air Conditioning Units

Monday, June 18th, 2012

A typical Atlanta air conditioning system consists of an outdoor condenser unit and an indoor air handler unit, which combine to cool and distribute air through your home. But, in cases where you already have a functional air handler, such as part of a heating system, you may not need to install a totally new one when installing air conditioning. Instead, the existing air handler can often be retrofitted to work with the new air conditioning unit.


The typical way to retrofit an air handler to an AC unit is to mount an evaporator coil on top of the existing furnace. The evaporator coil is the component of an AC system which is responsible for cooling and dehumidifying the ambient air – the very process that we think of when we imagine air conditioning.

The problem with simply installing a new evaporator coil and using the existing ductwork and blower fan is that the evaporator coil can be the wrong size, which can lead to performance problems and cause the refrigerant in the coil to freeze. If the evaporator coil is too large for the capacity of the blower fan, the air handler can’t move enough air across the evaporator coil to prevent the freezing, which will halt operation of the air conditioner altogether.


An existing air handler can be retrofitted to accommodate a newer air conditioning unit, as long as the challenges of the size of the evaporator coil are taken into account.

In addition to making sure the coil is not too large in relation to the existing air handler, the velocity of the blower has to be matched to the needs of the coil. A qualified Atlanta air conditioning professional can handle those problems for you during installation, or, in the case that you purchased a home with a retrofit installation, examine an existing system for you to make sure everything is installed properly.

Call Cool Air Mechanical today if you have any questions about Atlanta air conditioning installation!

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Atlanta Air Conditioning Installation Guide: Examine Your Ductwork

Monday, June 4th, 2012

Installing a new air conditioning system is a big deal for most homeowners; it’s a big investment and a piece of equipment that will be in your home for a long time. Replacing your air conditioning system will not only make your home more comfortable, it will also be much more energy efficient than your old unit.

However, before you install your new system there are a few things that you should do. In addition to consulting with an Atlanta air conditioning contractor to find the best AC system for your home’s needs, you should also have your ducts examined.

Air ducts are an essential part of any forced air system. But without regular maintenance, your air ducts can become leaky or broken, resulting in inefficient heating and cooling. They can also accumulate dust and other indoor air pollutants unless they are cleaned on a regular basis. If you are installing a new air conditioning system, it’s a good idea to make sure that your ducts are clean and in good repair. A professional inspection will identify any damage, debris, or other problems that could prevent your AC from functioning effectively.

You also need to make sure that your ducts are the right size for your air conditioner, and that you have enough vents to distribute the air throughout your home. This is only of the many things that your Atlanta air conditioning contractor will check as a part of the installation process. While it might seem like a minor issue, your ductwork can have a big impact on both the comfort of your home and your utility bills.

Properly installed and maintained ductwork is vital for the operation of your HVAC system, including your new central air conditioning unit. If you are thinking about having a new air conditioning system installed, give the professionals at Cool Air Mechanical a call today! We will inspect your home and ductwork to ensure that your new system will work as effectively as possible.

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