Service Experts Heating and Air Conditioning was built with the determination of delivering customers with the most excellent heating and cooling practices in the industry. Since its foundation, Donelson Air Service Experts in Nashville has been faithful to community, offering the first class HVAC (Heating, Ventilation, Air Conditioning) products and services in the area. If you are interested in more information about your regional HVAC leaders, give us a call at 615-953-9885 or set up an appointment with us online.
A more efficient method of controlling humidity is to use the waste heat from the refrigeration cycle itself. Instead of rejecting the waste heat outdoors, the heat is directed inside when humidity control is required. One form of heat reclaim is called hot-gas reheat or “refrigerant desuperheating” where refrigerant is passed through a heat exchanger located downstream of the cooling coil. The hot high pressure vapor leaving the compressor passes through this heat exchanger prior to entering the condenser coil. This in turn heats the indoor air and again causes the AC system to run longer to meet the thermostat set point. Although more energy is used, this is much more efficient than turning on an electric heater. Another form of heat reclaim is called sub-cool reheat. This strategy takes the warm liquid refrigerant from the condenser and passes it through a heat exchanger located downstream of the cooling coil. Less heat is available using this method because the majority of the heat has already been rejected at the condenser. Since more energy is used to pump liquid (as opposed to a gas) through the heat exchanger it would appear that this method is less efficient than the hot-gas method, however, the liquid in the heat exchanger is sub-cooled in the cold supply air stream which increases the capacity of the air conditioner. Since more capacity is available, the AC units is able to meet the thermostat more quickly.
The condensed, pressurized, and still usually somewhat hot liquid refrigerant is next routed through an expansion valve (often nothing more than a pinhole in the system's copper tubing) where it undergoes an abrupt reduction in pressure. That pressure reduction results in flash evaporation of a part of the liquid refrigerant, greatly lowering its temperature. The cold refrigerant is then routed through the evaporator. A fan blows the interior warm air (which is to be cooled) across the evaporator, causing the liquid part of the cold refrigerant mixture to evaporate as well, further lowering the temperature. The warm air is therefore cooled and is pumped by an exhaust fan/ blower into the room. To complete the refrigeration cycle, the refrigerant vapor is routed back into the compressor. In order for the process to have any efficiency, the cooling/evaporative portion of the system must be separated by some kind of physical barrier from the heating/condensing portion, and each portion must have its own fan to circulate its own "kind" of air (either the hot air or the cool air).
Turn off the gas supply valve, typically located by your gas meter on the gas inlet pipe. Turn off the gas by rotating the valve one quarter turn with an adjustable wrench. When the gas is off,  the valve’s oblong stem points perpendicular to the inlet pipe. Then call your gas utility or the fire department from a remote location. Do not return to your home until you know it is safe.

Architectural acoustics Architectural engineering Architectural technologist Building services engineering Building information modeling (BIM) Deep energy retrofit Duct leakage testing Environmental engineering Hydronic balancing Kitchen exhaust cleaning Mechanical engineering Mechanical, electrical, and plumbing Mold growth, assessment, and remediation Refrigerant reclamation Testing, adjusting, balancing

You can install the greatest HVAC system ever built, but if your house is not insulated well, it's only going to end up costing you more money. Older homes may have fiberglass insulation that has broken down due to pests, moisture, or improper installation. Spray foam insulation can be damaged by careless repair or modification work or can be improperly installed. If your insulation in compromised, your attempts to save money and be comfortable will be in vain.


An air handler contains the components that move the air throughout your home, called the blower. It is usually set inside the home and operates with both the heating and cooling components of your HVAC system. If you take a quick look at an air handler, it may closely resemble a furnace. Air handlers can run with an air conditioner and contains the indoor coil, used to cool and heat your home depending on which system it’s running with.


Mr Manns did a great job of explaining what he was doing. I learned some new things. One request: before using the hose, please ask to use it. In my particular case, the spicot is misbehaving. I have a particular method for turning it on/off to minimize aggravating the problem. So while there are no problems with him using it, I want to turn it on and off but was not given the opportunity to do so.
Baker Brothers Air Conditioning company offers residential HVAC services including a/c and air conditioning repair, a/c and air conditioning replacement, a/c and air conditioning installation, a/c and air conditioning tune up, a/c and air conditioning inspections, a/c and air conditioning maintenance on air conditioning units and systems in most or all of the following Dallas, TX ZIP Codes: 75229, 75230, 75225, 75220, 75209, 75219, 75247, 75212, 75235, 75201, 75207, 75248, 75287, 75252, 75244, 75254, 75240, 75251, 75248-1713, 75214, 75228, 75243, 75238, 75218, 75206, 75231, 75204, 75226, 75246, 75227, 75208, 75217, 75232, 75224, 75211, 75241, 75215, 75233, 75253, 75216, 75223, 75237, 75249, 75203, 75210
In the case of direct expansion equipment, the air passing over the indoor cooling coil heats the cold liquid refrigerant. Heating the refrigerant causes boiling and transforms the refrigerant from a cold liquid to a warm gas. This warm gas (or vapor) is pumped from the cooling coil to the compressor through a copper tube (suction line to the compressor) where the warm gas is compressed. In some cases, an accumulator is placed between the cooling coil and the compressor to capture unused liquid refrigerant and ensures that only vapor enters the compressor. The compression process increases the pressure of the refrigerant vapor and significantly increases the temperature of the vapor. The compressor pumps the vapor through another heat exchanger (outdoor condenser) where heat is rejected and the hot gas is condensed to a warm high pressure liquid. This warm high pressure liquid is pumped through a smaller copper tube (liquid line) to a filter (or filter/dryer) and then on to an expansion device where the high pressure liquid is reduced to a cold, low pressure liquid. The cold liquid enters the indoor cooling coil and the process repeats.
In a chilled water system, liquid water is pumped throughout the building to “chilled water coils”. Since the liquid water needs to be at a cold temperature, a “cooling plant” is required. The plant is typically referred to as a chiller plant. Vapor compression equipment in the plant, similar to that described in “How does my AC work”, cool water to a cold temperature and pump the cold water to air-to-water heat exchangers where needed.
If your furnace sputters to a halt during the evening or overnight in the middle of winter, you can bet that the indoor temperature will plummet by morning and everyone will be cold and uncomfortable. It isn’t as bad as outside because you have wind protection and residual heat, but no one in the house will be happy. The key to finding a quick solution to these kinds of scenarios is to align yourself with a reputable, reliable service provider before there is a problem. If you have a local expert in your corner, you can call as soon as something happens and your service disruption will be minimal.
Wiring up the thermostat is usually pretty straightforward if an old one is being replaced. If a thermostat is being put in where one had never been before, that could involve running new wiring. The placement of the thermostat is also important so that its sensors can get an accurate reading of the temperature. A thermostat that is blocked by a bookcase or other large furniture will not get a good reading and will not perform efficiently.

Although HVAC is executed in individual buildings or other enclosed spaces (like NORAD's underground headquarters), the equipment involved is in some cases an extension of a larger district heating (DH) or district cooling (DC) network, or a combined DHC network. In such cases, the operating and maintenance aspects are simplified and metering becomes necessary to bill for the energy that is consumed, and in some cases energy that is returned to the larger system. For example, at a given time one building may be utilizing chilled water for air conditioning and the warm water it returns may be used in another building for heating, or for the overall heating-portion of the DHC network (likely with energy added to boost the temperature).[4][5][6]
Hi John, Thanks for reaching out, we would be happy to help you connect with a pro for your project. You can submit a request to our pros here: www.homeadvisor.com, browse a list of pros that serve your area here: http://www.homeadvisor.com/c.html, or send your info to [email protected] and a project advisor will reach out to assist you. –HASupport
All modern air conditioning systems, even small window package units, are equipped with internal air filters. These are generally of a lightweight gauzy material, and must be replaced or washed as conditions warrant. For example, a building in a high dust environment, or a home with furry pets, will need to have the filters changed more often than buildings without these dirt loads. Failure to replace these filters as needed will contribute to a lower heat exchange rate, resulting in wasted energy, shortened equipment life, and higher energy bills; low air flow can result in iced-over evaporator coils, which can completely stop air flow. Additionally, very dirty or plugged filters can cause overheating during a heating cycle, and can result in damage to the system or even fire.
Our Baker Brothers Family Plan membership provides you with an annual inspection of your furnace. This will help keep it working properly so it’s there for you when you need it most. Preventative maintenance is the best way to ensure your system is working as efficient as possible and not costing you more than it needs to on your monthly utility bills.

Air Blue Heating and Cooling Inc. delivers 100% satisfaction guaranteed on all residential and commercial installation, service and repair projects. We offer a 2 Year Repair Warranty and a Lifetime Installation Guarantee. Every service is handled in an organized manner, with careful clean up at completion, and an end result that meets your highest expectation.  Through proficient workmanship and quality products, we trim energy costs and ensure reliability.  Through our commitment to excellence, we fulfill your everyday requirements with exceptional solutions.
In variable climates, the system may include a reversing valve that switches from heating in winter to cooling in summer. By reversing the flow of refrigerant, the heat pump refrigeration cycle is changed from cooling to heating or vice versa. This allows a facility to be heated and cooled by a single piece of equipment by the same means, and with the same hardware.
I need a complete system replacement , before I was trying to get an evaporator coil replaced , of course the price is between $2200 an $2800 , then get told it probably will over tax my ac unit within months , so now and like everyone else what do you buy 14 ,15 16 17 seer units ,price and how do we know its reasonable  why can't there be '" a estimated price ,in the ball park, a range of prices ,so we can at least go from their .....  Now it's from 7500 to 15000. Frustrating  from the start so everybody good LUCK.   Draw a # from the hat    Unregulated  and who do you BELIEVE, just like on NCIS go with your gut feelin   
When we’re in a customer’s home, we’re always on the lookout for things we can do to help them out and put a smile on their face. It could be as simple as changing a lightbulb or as involved as cleaning gutters, listing a car for sale online, or repairing a broken gate. There’s no limit to what we might do, and of course, there’s never any charge to help out. It’s good deeds for FREE!
The performance of vapor compression refrigeration cycles[24] is limited by thermodynamics. These air conditioning and heat pump devices move heat rather than convert it from one form to another, so thermal efficiencies do not appropriately describe the performance of these devices. The Coefficient-of-Performance (COP) measures performance, but this dimensionless measure has not been adopted. Instead, the Energy Efficiency Ratio (EER) has traditionally been used to characterize the performance of many HVAC systems. EER is the Energy Efficiency Ratio based on a 35 °C (95 °F) outdoor temperature. To more accurately describe the performance of air conditioning equipment over a typical cooling season a modified version of the EER, the Seasonal Energy Efficiency Ratio (SEER), or in Europe the ESEER, is used. SEER ratings are based on seasonal temperature averages instead of a constant 35 °C (95 °F) outdoor temperature. The current industry minimum SEER rating is 14 SEER.[25]

What happens when you have an emergency? The first reaction of most people is to panic. When a furnace stops working, you need it fixed and fixed immediately—especially in the middle of a cold, Ohio winter. That need can make people feel as if they are at the mercy of the repair company. That is why it is so important to call a company you can trust and rely on—Jennings Heating and Cooling.
Relative humidity is the ratio of the partial pressure of water vapour in an air-water mixture to the saturated vapour pressure of water at a prescribed temperature. In prevailing Northern European conditions relative humidity and percentage saturation (ration of moisture content) can be considered the same as the divergence is <1%.  In high temperature areas they should be treated differently as the divergence may be as high as 10%.
High-efficiency condensing furnaces (90% AFUE and above) are a bit more complex than conventional furnaces. The main differences between a conventional and condensing furnace are the heat exchanger technology used to extract heat from the combustion process and the method used to exhaust the combustion gases. In these ways, the furnaces are very different. The condensing furnace does not have a significantly more efficient combustion process than does a conventional furnace; both use gas burners with electronic ignition. The difference lies in that the condensing furnace has a more efficient heat extraction process after combustion.
This is probably the most common question we hear. To give an accurate price, we need to get a safety certified technician out to your home in a fully stocked truck to take a look at your particular situation. Our technician will give you a precise price with your options BEFORE any work begins. Each of our technicians are well trained, experienced, drug tested and background checked so that you can rest easy knowing your services will be performed in a timely and professional manner. If you need help paying for your services, we even offer financing with approved credit through Wells Fargo. Click here to learn more about our financing services.

As one of the premier heating & cooling companies in St. Louis, Vogel has dedicated our business to serving our customers with the utmost quality in HVAC services for both residential and commercial entities alike. We strive to build out a culture within our team that delivers the kind of experience you deserve when working with a service provider. The qualities that are most important to you, are most important to us - convenience, trustworthiness, good value, impeccable quality, and our willingness to stand behind our successes and learn from our mistakes. We invite you to explore our site, see what customers say, and give us a call.
My heat pump/hvac system is not blowing cold air anymore, got checked out was told compressor broken. was told it cost  almost the same to repair/replace they recommend whole system. It's the same company that installed it 18 years ago, telling me that system is old and it will cost $9-10k for new system, because furnace has to be replaced with new hvac. what to do, need answers thanks????
Furnace Circuit Board -- The furnace circuit board controls a variety of functions. It not only handles the regular operation of the furnace, it also monitors the furnace's various safety circuits. Over time, vibrations from the furnace can weaken solder point and cause them to separate. Dirt and debris can cause short-circuits that damage the board. Failure of the circuit board can cause a variety of effects ranging from the fan not turning on to the complete shutdown of the furnace.
This single phase 13 SEER sweat air conditioning This single phase 13 SEER sweat air conditioning system is designed for residential and commercial applications and consists of the outdoor condenser indoor cased coil and 30 ft. line set. The compact micro-channel condenser is charged with R-410A refrigerant and has a top air discharge. The cased coil is filled ...  More + Product Details Close
Rheem's RRNL features a scroll compressor with fewer moving parts and less noise than traditional reciprocating compressors. A louvered compressor compartment protects the compressor from the elements and from debris that can shorten the life of the compressor. The Classic series continues to be one of their best sellers, with the addition of the Comfort Alert diagnostics module integrated to assist technicians in the event your system needs repair. 2-5 tons, 13 SEER, 80% AFUE.

Lennox was started to offer some of the most long-lasting, reliable HVAC systems in the market while providing the best service and quality for customers. Knoechel Heating Company in Zelienople is no different, with our on-going dedication to your comfort and commitment to the community. We strive to be the experts at what we do so you can always be comfortable, and know you can always count on us. Give us a call at 724-452-6280 or arrange an appointment with us so we can help you achieve whole home comfort. 
To clean your air conditioner drain, first shut off the power to your unit at both the thermostat and the breaker. Then remove the drain pan. If the pan is full of water, soak up the liquid with a few towels or rags or use a wet vacuum. You can use a solution of water and distilled vinegar, or substitute peroxide for the vinegar, to clean out the drain pipe. Let the pipe sit for a while in the solution and then put all the parts back in place. Once you start using your air conditioner on a regular basis, check it periodically to ensure condensation isn't building up.
Honesty and integrity go a long way with me also pricing was very fair.....A-ok gets it done.... My a/c just stopped working after 12 a.m. I called 3 companies and no one was able to come out till the morning. I couldn't wait till morning due to the fact I have elderly people living with me. so I call A-ok and Tyler was the tech on call for the night. He was super helpful and friendly. Tyler was a few counties away but made the call to rush to my home after 12 am. And fix my unit. It was getting pretty hot inside my house. Turns out it was just a fuse that went bad. He was able to correct it in minutes. I'm thankful Tyler is a honest young man. He could have said anything to run up the bill but he didn't... it was just a blown fuse. I high recommend A-OK for service needs. The pricing was fair and matched up better than everyone else.... the difference which is huge was Tyler came out to do the repair where as every other company wanted me to wait till the morning. Thank you Tyler for getting my unit back in order and I'm happy to say they have my Business going forward....

You might also want to check your home for thermal insulation if you live in extreme heat or freezing temperatures. Insulation keeps the heat and cool air in your home, which can lead to a lower electric bill. If the heated or cool air leaks out, your system turns on more often. There are various types of insulation that you can install in your home and a home energy auditor can point out the best places for it in your house.
Air conditioners come in two basic types—central and window. A central AC provides cooling to your entire home, while a window AC cools just the room where it’s installed. If you’re not using a heat pump, you can pair an air conditioner with a furnace to provide both heating and cooling. Just to make things a bit more confusing, a central air conditioner housed together with a furnace in a single cabinet is also known as a packaged unit!

Many things can go wrong with your furnace, all of which should be repaired and examined by experienced professionals. Trust Randazzo Heating, Cooling, and Fireplaces to repair and help you maintain your furnace*. We value our customers and their decisions, so we will always be honest and explain the best possible solution for you. Contact us today so we can help you out! Click Here for our warranty policy.
Replacing your old AC is a great way in which to make your home a more comfortable place to live as well as to cut down on energy costs in your home. Of course, this is only true if you invest in a quality system and allow a skilled professional to handle your air conditioning replacement in Issaquah, WA. Give us a jingle to kill those 2 birds with 1 stone.
We’ve earned a reputation across Portland and The Dalles for dedicated customer service.  Consistently maintaining an A+ rating from the Better Business Bureau, Sky Heating & Air Conditioning meets higher standards of excellence through the little, important details that add up to a job well done.  It starts with a friendly voice on the phone, and the immediate focus of our extensive resources on your requirements.  From there, you can count on timely arrival, organized project management, careful cleanup, competitive pricing, and exemplary performance in every aspect of service.  When you contact Sky Heating & Air Conditioning for HVAC service in The Dalles and Portland, OR, your project is always handled by a highly-trained professional, who will achieve your goals for efficiency, reliability, and sustainable home comfort.
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