Heating & Air Conditioning Installation & Repair

Some Advice

Some Advice and Tips to Consider When Buying a New System

Central Air Conditioner Buying Tips

  • The type and size of air conditioner you need depends on your climate and cooling loads. Evaporative coolers are practical in hot, arid regions such as the southwest. For other regions, compressor-driven air-conditioning systems are the only choice.
  • When you are shopping for a central air conditioner, look for a SEER rating higher than 14.00 SEER.
  • If you already have a forced-air heating system, you may be able to tie an air conditioner into existing ducts, depending on their size and your home’s relative heating and cooling loads. A good HVAC contractor can do the calculations for you.
  • Proper sizing and installation are key elements in determining air conditioner efficiency. Too large a unit will not adequately remove humidity. Too small a unit will not be able to maintain a comfortable temperature on the hottest days. Improper unit location, lack of duct insulation, improper duct sealing, and incorrect refrigerant charge can greatly diminish efficiency
  • When buying a central air conditioner, look for a system with a fan-only switch so you can use the unit for nighttime ventilation to substantially reduce air-conditioning costs; a filter check light to remind you to check the filter after a predetermined number of operating hours; and an automatic-delay fan switch to turn off the fan a few minutes after the compressor turns off.
  • Look for a unit with quiet operation.
  • If you need or want to replace your existing air conditioner’s outdoor (compressor) unit, make sure the indoor (blower coil) unit is compatible with the new outdoor unit. A highly efficient outdoor unit will not achieve its rated efficiency if paired with an older blower coil.

Tips for Buying a New Room or Addition Air Conditioner

  • When shopping for an air conditioner, first determine which type of system best suits your needs- central air conditioning or room air conditioning. Central air conditioners are designed to cool an entire house, while room air conditioners are usually window-or wall-mounted units that only cool the immediate area.
  • Three types of room air conditioners are available:
    • Window models that can be installed in most double-hung windows
    • Ductless mini-split systems
    • (PTAC) built-in models that are encased in a sleeve installed in the wall.
  • Proper sizing is very important for efficient air conditioning. A bigger unit is not necessarily better because a unit that is too large will not cool an area uniformly. A small unit running for an extended period operates more efficiently and is more effective at dehumidifying than a large unit that cycles on and off too frequently.
  • When determining the appropriate size air conditioner for your home, consider the dimensions of the area to be cooled. Based on size alone, an air conditioner generally needs 20 Btu for each square foot of living space. Another popular formula is based on 400-500 square feet per ton. Other important factors to consider when selecting an air conditioner are room height, local climate, shading, window size, etc.
  • Verify that your home’s electrical system can meet the unit’s power requirements. Room units operate on 115-volt or 230-volt circuits. The standard household receptacle is a connection for a 115-volt branch circuit. Large room units rated at 115 volts may require a dedicated circuit and room units rated at 230 volts may require a special circuit.
  • If you are mounting your air conditioner near the corner of a room, look for a unit with an airflow in the desired direction for your room layout.
  • Look for a unit whose filter slides out easily for regular cleaning.
  • Select a unit with logically arranged controls, a digital readout for the thermostat setting, and a built-in timer.
  • When considering several comparable units, select the unit with the higher SEER.

What is a Seer Rating?

SEER Ratings and What They Mean

SEER Rating Graph

SEER Rating Graph

SEER rating are the method used to describe the efficiency of a particular equipment system. SEER stands for “Seasonal Energy Efficiency Ratio”. The systems purchased today typically range from 10.00 SEER to 18.00 SEER. If you have a home and the current system is 10-15 years old, you may have a system that ranges from 6.0 SEER to 10.00 SEER. Of course at the time it was installed, 10.00 SEER was considered “High Efficiency”. Today, with all the focus on conservation and energy savings, that “High Efficiency 10.00 SEER” from 10-15 years ago is growing obsolete.

In the chart, the left column indicates operating costs and the gradually decreasing scale shows how with a higher SEER rating (numbers along bottom of chart) the operating costs are reduced. In essence, if you would have spent $100 to operate an 8.00 SEER system, by installing a 14.00 SEER system, your operating costs would drop to $57.00 as opposed to the $100 spent operating the lower efficiency system. These are estimates only, and designed to show that with the higher the SEER rating, the lower the operating costs.

If you have a 6.0 SEER, and you installed a new 12.00 SEER or 13.00 SEER system, you would cut your power consumption in half (in regard to your AC System). Considering that in many cases the central air system represents the largest draw on power in your home, any improvement is a wise decision.

The systems today are very advanced as you move up in the efficiency range. They cost a bit more at initial purchase, but when you calculate the energy savings -vs- dollars spent they pay for themselves fairly quickly.

Lets look at an example:

Current system is 6.0 SEER and power bill runs $150.00 per month.

A 10.00 SEER system is $1500.00 and your power bill may be $125.00 per month.

Upgrade to a 14.00 SEER system for an additional $800.00 and your power bill drops to $90.00 per month.

The price between the 10.00 SEER and the 14.00 SEER is $800.00. The monthly savings equate to $35.00 per month (14.00 SEER  -vs- 10.00 SEER). Take the $800.00 difference and divide that by the $35.00 savings and you would pay off the improved system through energy savings in 22.86 months. Less than 2 years.

No matter what, you were going to replace the system with at least a 10.00 SEER system.

Improved power bill, increased value of home, and your system won’t be obsolete in 2 years. Wise decision. Bear in mind, the ratio of savings varies from household to household as people live differently in each case. The example given above is strictly as an example and there is no guarantee that you will see that exact example in your home.

How Much Can I Save?

Cooling efficiency is measured in SEER (Seasonal Energy Efficiency Ratio) and heat pump heating in HSPF (Heating Seasonal Performance Factor).

cost savings graphRatings works like gas mileage on your car. SEER VS. Cooling Chart The higher the SEER or HSPF number, the higher the efficiency and the greater the energy savings.* For instance, if your old unit is 10 to 15 years old, the efficiency rating could be a wasteful 6 SEER. This chart gives you a sample of you how much you could save by upgrading to the Comfortmaker system that fits your needs.

* Savings percentages based on national averages at 10 SEER and may vary according to efficiency of current unit and temperature zone location.

Some other Energy Saving Tips:

  • Seal the windows in your home around the frames
  • Consider dual pane insulated windows when you opt to replace your current windows
  • Improve your insulation factors in your attic to R-30
  • Seal the current duct system in your home with tape, fab and sealants (mastick)
  • Improve the style of registers you currently have for better “Throw”
  • Make sure your cold air return is large enough for the system (SEE BELOW)
  • Install ceiling fans throughout your home
  • Keep your filter cleaned and changed monthly
  • Keep your unit serviced. Maintenance plans with your local air conditioning contractor will do wonders for your system. At least twice per year.

These are just a few ideas that are proven to work. Common sense should prevail in regard to maintaining your unit. A maintenance plan generally cost less than $200.00 per year all across the country and is a wise decision. It could mean the difference between your unit lasting only 8 years or lasting 20 years.

Choosing the Correct Unit for Your Home

Central Air Conditioning Units


Central Heating and AirAh, summer. For those with AC, it’s a wonderful season full of outdoor (and indoor!) fun; for those without, it can be miserable and even dangerous. Homeowners in the market for a new central air conditioner will be pleased to know that today’s central air conditioning units are far more efficient than models even just 10 years old.

Here’s a guide to choosing the right central air conditioning unit for your house’s needs.

Types of Central Air Units

Conventional Central Air Conditioning Units: A conventional air conditioner system works by drawing hot, humid air into return ductwork, cooling and dehumidifying it and returning it into the room. The newly cooled and dehumidified air is much more comfortable. Central air conditioning units can be split, meaning there is a condenser/compressor unit outside and an evaporator unit inside, usually mounted on the furnace or an air handler. Units can also come packaged, where the compressor and evaporator are in a single unit is outside.

If you are planning to retrofit an existing home with central air, a conventional system can use the house’s established duct work if the heat is forced air. If your home doesn’t have ductwork, it will need to be installed in the attic, basement or crawlspace. This drives up the cost, making installation sometimes out of reach

Ductless Central Air Conditioning Units: In this case, homeowners might consider a ductless system, sometimes referred to as a mini-split system. It works using an outdoor compressor that serves individual units that contain an evaporator and blower fan. These are usually placed on the top half of a room’s exterior walls. Units are large, but relatively unobtrusive. It is often more expensive than a conventional unit, but homeowners can save a lot of money by not having to have their homes fitted with duct work. As opposed to window units, a ductless system is quieter, doesn’t block your view and will also heat the home.

Choosing a Central Air Unit

After you select a type of central air conditioning unit, you’ll need to determine what size and what level of efficiency is needed to best serve your needs and stay within your budget.

Size: Get a central air unit that is too big, and your house will be damp and cold and it will cycle on and off too much. If it is too small, it will not be able to keep up and could freeze. A lot goes into determining the size of the air conditioning unit: size of the home, number of stories, insulation, number and quality of the windows, amount of direct sunlight and even the amount of shade your home gets. Collectively, this is called a cooling load analysis. The HVAC technician who you work with will do this for you, but you can go to www.northernac.com to get a general idea of what you will need.

Efficiency: Today’s low-efficiency units are as good as high-efficiency central air units made just 10 to 12 years ago. With the price of energy skyrocketing, it’s a great time to replace an old unit. You could save 30 to 50 percent on cooling costs and reduce your home’s environmental footprint.

Central air conditioning units have a Seasonal Energy Efficiency Ratio (SEER) making it easy for consumers to know how efficient a system is. The higher the number, the more efficient the unit. The standard number is 13.

Filter: If you have a family member who suffers from allergies or asthma, air quality is important. Look for an AC unit with a high Minimum Efficiency Reporting Value (MERV). A rating of 8 is standard.

Noise: If quiet is important, look for a unit with a Scroll compressor.


You can expect to pay a lot for central air conditioning. According to CostHelper.com, the price can be anywhere from $3,500 -$7,000, depending on a variety of factors, including the size of your home, what needs to be done and the efficiency of the model you choose. If you need duct work installed, it can run $8,000-$10,000 or more.

Choosing an air conditioning unit that will work most efficiently in your home is important. A professional installer – or a manufacturer representative, if you plan to do it yourself – can help you determine which unit is best.

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Good and Dependable Guys

My AC was messed up real bad,I called Tommy and he came right out looked and tested the problem and got me an inside and… Read more “Good and Dependable Guys”

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Dependable and Prompt Sevice

My AC was messed-up bad to where it was putting out heat and would not shut off, I called Tommy, he came over right away,… Read more “Dependable and Prompt Sevice”

Greg Johnson

Outstanding Service

I have used this company several times on my home and my rental and every time I’ve had outstanding service. They are very professional, knowledgeable… Read more “Outstanding Service”

Michelle Hengen

Dependable Air is just that

Dependable Air is just that…Dependable! Tommy the owner and his right hand man Riley are always providing the best customer service. They will go way… Read more “Dependable Air is just that”

Bridget Laphan Manager Magnolia Crossing

Can’t Be Beat

AC cooling problem develop around 1 o’clock in the afternoon ..called dependable AC ! Mr. Howze had his service tech Riley show up at the… Read more “Can’t Be Beat”


Thank you

Left a message for them to call me first thing on a Saturday morning….air stopped working Friday night….they sent Riley over, who was fast, efficient… Read more “Thank you”


I recommend this company

i will always recommend this company. they are honest nice and stand by their work. i called them after hours last night and they were… Read more “I recommend this company”


Such good service

I started using Dependable AC for repairs on my downstairs heat pump. I was very impressed. He set up an appointment very quickly and arrived… Read more “Such good service”


Highly recommend this company

Tommy and his men installed a complete new air conditioning and heating system for my wife and I. We are very satisfied with Tommy and… Read more “Highly recommend this company”

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my go to guys

Being an out of town customer can be a headache because you never know who may show up. The male technician who assisted us was… Read more “my go to guys”

Mrs. Johnson

Electric bill was down by 30%

Due to the a/c’s lack of cooling and my outrages electric bills I had wanted to replace my unit with a newer up to date… Read more “Electric bill was down by 30%”

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honest and knowledgeable

Called Dependable for a 2nd opinion. Tommy came out and figured out the problem, was very honest and knowledgeable and got us back in working… Read more “honest and knowledgeable”

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I will call Tommy again

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Not only did he come service my ac which had stopped working on a Sunday, but he was professional and polite. So thankful he was… Read more “Great service”

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Thanks again Tommy!!

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this is the guy to call!!!!

called and they were at my house within a couple hours, spend almost 2 hours figuring out what exactly was wrong. the prices were outstanding,… Read more “this is the guy to call!!!!”

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Great customer service!!

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fixed it with in less then 2 hours

I called Tommy to help my grandmother who lives in Ocean Springs, with very little noitce. He came right over knew what was wrong and… Read more “fixed it with in less then 2 hours”

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Price was very reasonable

Tommy was very kind and patient with me. I called and he came the same day service. I was very impressed on how prompt he… Read more “Price was very reasonable”

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Very Impressed

I was very impressed by how fast you got to my home to fix my air THEN you found additional problems other a/c guys were… Read more “Very Impressed”

Krista Mejia

Thank You

Thank you so very much for installing our new Ac System. We are very happy with your work.

Rouand Rouand

Great Customer Service

Great Customer Service. Super fast response time, from calling to the arrival of the technician, 20 minutes. They are definitely the company of choice that… Read more “Great Customer Service”

Jennifer Sanders

Thanks Tommy!

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Tommy was here within an hour

My AC went out last night… and this morning the house was muggy. Ugh. Tommy was here within an hour of my call, found the… Read more “Tommy was here within an hour”

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Excellent Job

Tommy came out to our house today and fixed the problem in about 45 minutes. Not only did he do the work, he gave me… Read more “Excellent Job”

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Thanks Tommy

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Fast Response

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Dependable AC……. dependable!

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Euguen Brezany


Our AC went out on a Sunday. He sold us a unit and had us up and running Tuesday morning. He is very prompt and… Read more “Professional”

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Good Job

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Angela Lynch