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%.
Humidity is becoming more of a concern to building operators and owners. High indoor humidity leads to mold and mildew growth inside the building. The are several methods of controlling indoor humidity. The simplest (and most expensive) method is to connect a humidistat to an electric heater. When the humidity inside the building rises above the humidistat set point, the heater is turned on. The additional heat causes the air conditioning system to run longer and remove more moisture.
Heaters exist for various types of fuel, including solid fuels, liquids, and gases. Another type of heat source is electricity, normally heating ribbons composed of high resistance wire (see Nichrome). This principle is also used for baseboard heaters and portable heaters. Electrical heaters are often used as backup or supplemental heat for heat pump systems.
How do you choose the right HVAC system for your home? What’s the difference between an air conditioner and a heat pump, and how do I know which system I need? If you’re shopping for a new HVAC system, air conditioner, or furnace, then chances are you’ve probably asked yourself (or Google) those questions. But here at Ruud you’re talking to the experts – our HVAC system selection guides below offer a great starting point for choosing the best HVAC system for your home, and once you’re ready to find a trustworthy and licensed installer, we’ve got you covered with Ruud’s nation-wide network of vetted Ruud HVAC contractors.
As a Carrier Factory Authorized Dealer, M and M, Heating & Cooling, Plumbing & Electrical is qualified to properly size and install the most technologically advanced and well-regarded heating, cooling, and air quality products on the market today. Our team is NATE-certified, factory trained, EPA certified, and regularly updated, ensuring the right solution to any challenge.
In 1906, Stuart W. Cramer of Charlotte was exploring ways to add moisture to the air in his textile mill. Cramer coined the term "air conditioning", using it in a patent claim he filed that year as an analogue to "water conditioning", then a well-known process for making textiles easier to process. He combined moisture with ventilation to "condition" and change the air in the factories, controlling the humidity so necessary in textile plants. Willis Carrier adopted the term and incorporated it into the name of his company.[10]
Here at Brothers Plumbing, Heating, and Electric, we have a Home Care Club that provides members with many benefits. These benefits include: 2 year warranty on all work (drain work is excluded), transferable club membership, no “show up” fees, priority service, 10% discount on repairs, quarterly newsletters, carefree scheduling (we will contact you and remind you when you need service), 2 free furnace/air conditioner filter changes, exclusive coupons, quarterly drawings, 4 on-going safety checks, and a 100% satisfaction guarantee. So if you’d like to join our Home Care Club, then give us a call or click here today.
As a Bryant Factory Authorized Dealer, Welzig Heating & Air consistently performs to strenuous standards of technical competence, business ethics, and customer approval.  Our team is NATE-certified, factory trained and regularly updated in progressive technology.  Equipped with leading edge equipment, tools, and a full inventory of genuine manufacturer’s replacement parts, we properly size and install new systems, accurately diagnose existing systems, and resolve the majority of issues right then and there.
A type of air conditioning system using a water/glycol solution as a condensing medium. Typically, the glycol-cooled condenser is located inside the air conditioner with the rest of the refrigeration components.  Water/glycol is piped to the unit from a drycooler or other suitable source. The glycol keeps the solution from freezing during winter operation.
CIBSE publishes several guides to HVAC design relevant to the UK market, and also the Republic of Ireland, Australia, New Zealand and Hong Kong. These guides include various recommended design criteria and standards, some of which are cited within the UK building regulations, and therefore form a legislative requirement for major building services works. The main guides are:
For starters, once a year, vacuum out the area around the furnace’s blower. If possible, also slide out the fan unit, clean each fan blade with a toothbrush, and then vacuum with a brush attachment on a vacuum cleaner. While you’re at it, look for oil ports on the motor, normally located near the motor shaft. If the motor has these, apply two to three drops of non-detergent motor oil into each port (you may have to remove a cover plate to do this). Though most contemporary motors don’t require lubrication, do lubricate motors with oil ports once a year. For more about maintenance, see Maintenance Checklist for Central Heating Systems.

An air conditioner's compressor contains a refrigerant. As it works, it sends this refrigerant through the system. As warm air blows across the coil that carries this refrigerant, the heat transfers to the refrigerant (cool always absorbs warm). A fan moves the cooled air through the ducting and out of vents that lead into the rooms of your house. The refrigerant returns to the compressor where the absorbed heat is moved outside. The refrigerant is then sent through the coil once again to continue the cycle.
Has another company told you that your furnace has a cracked heat exchanger?  The heat exchanger is the heart of your furnace. Its failure can result in a dangerous situation for your home and the best solution is usually a new furnace.  Because of these issues, Bonney takes this situation very seriously.  We will offer you proof of the cracked heat exchanger in the form of a picture from our video inspection camera or a report from our exhaust gas analyzer, before we make our recommendation.

This type of furnace is fueled by liquid propane gas, which is burned to push hot air through your home. A pilot light ignites the burners within a combustion chamber, which push heat into the heat exchanger and eventually through your entire home. Repairing this type of furnace can be more expensive than its electric alternative. For example here are some common propane gas repairs and their costs:
That concludes our lesson in HVAC for now; hopefully it has educated you a little more on the various types of HVAC systems and what each of them contains. The primary goal for any HVAC system is to provide acceptable thermo comforts and good quality indoor air in a given building. With good knowledge of the available types and an understanding of your specific needs, it cannot be too hard to know what kind of a heating, ventilation and air conditioning system you would need.
YP - The Real Yellow PagesSM - helps you find the right local businesses to meet your specific needs. Search results are sorted by a combination of factors to give you a set of choices in response to your search criteria. These factors are similar to those you might use to determine which business to select from a local Yellow Pages directory, including proximity to where you are searching, expertise in the specific services or products you need, and comprehensive business information to help evaluate a business's suitability for you. “Preferred” listings, or those with featured website buttons, indicate YP advertisers who directly provide information about their businesses to help consumers make more informed buying decisions. YP advertisers receive higher placement in the default ordering of search results and may appear in sponsored listings on the top, side, or bottom of the search results page.
Whenever you need any installation, repair, or maintenance for your heating system, call Baker Brothers. We are committed to providing the best customer service and getting your issues solved quickly and efficiently. We service all major make and models of electric and gas heating system in your home. Baker Brothers employs only the best heater/furnace service professionals that are ready to get your home comfortable for you during those cold days and nights.
An energy recovery ventilator: This component helps improve the air inside your home by swapping it out with fresh air from the outside. During the winter months when houses are closed up to keep out the cold, the air inside becomes a handy way for colds and flu to infect an entire family. By circulating outside air inside, the health of your family will have a better chance.
Some systems include an "economizer mode", which is sometimes called a "free-cooling mode". When economizing, the control system will open (fully or partially) the outside air damper and close (fully or partially) the return air damper. This will cause fresh, outside air to be supplied to the system. When the outside air is cooler than the demanded cool air, this will allow the demand to be met without using the mechanical supply of cooling (typically chilled water or a direct expansion "DX" unit), thus saving energy. The control system can compare the temperature of the outside air vs. return air, or it can compare the enthalpy of the air, as is frequently done in climates where humidity is more of an issue. In both cases, the outside air must be less energetic than the return air for the system to enter the economizer mode.
Indoor Fan Motor -- Indoor fans circulate the air from your house and through the system. Age and dust buildup are the two biggest contributing factors to their failure. When they are starting to fail they will often make noise. Failure of the fan will result in no heating or cooling, and if it is not repaired soon, it can cause other components to fail.
Headquartered in Portsmouth, Virginia, Air Conditioning Specialists was established in 1997 and is a fully licensed, insured and experienced heating and cooling company. We strive to provide our customers with the quickest, most efficient HVAC service and installation. Our workmanship, along with the highest quality of home and business products available, ensures the dependable performance of your HVAC system and your family’s comfort year after year. Our staff welcomes the opportunity to serve you, and looks forward to building a long-term relationship. Our success is dependent upon 100% customer satisfaction and the referrals we receive from our many satisfied customers.
"I had several fits and starts trying to get an A/C HVAC system installed in my home in Boulder. I talked to multiple local contractors, and did a great deal of research on what people are paying for such work in various parts of the country. There is a huge disconnect between the Boulder market, and the rest of the country, based on nothing more than local contractors grossly overcharging gullible, very affluent, customers. This leaves the average Joe or Jane to either pay up, or fend for themselves. Some of the locals seemed promising, only to hit us with outrageously overpriced bids. I'm not talking about a 20% "local vig"--I'm talking 2-3 times national rates! Some never showed up, some came to look at the job, then never even followed up, like they just couldn't be bothered. Steels Bros, in complete contrast to these difficulties, showed up when they said they would, did what they said they would do, and did it all for a fair price. At each step, they were concerned that they were earning my satisfaction with their work. I am a huge believer in providing the best customer service possible in my own work, and Steele Bros showed the same commitment. I would not hesitate to recommend them to anyone that wants a big job done right, at a fair price. "
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.
The Rack Cooling Index (RCI) is a metric that measures the percentage of racks in the data centre where the air inlet temperature is at the recommended or allowable level under the guidelines put forth by ASHRAE. RCI (hi) is the metric for racks at the upper limit and RCI (lo) for racks at the lower limit. This metric reveals how uniformly and efficiently a data centre is being cooled.

When it comes to furnace repair, Roswell and area residents can rely on us for fast and efficient repairs. Moncrief has continued to be a consistent provider of heating and cooling services in the Roswell and Marietta. We have worked hard to gain your respect by providing quality services and products, and delivering on our promise of total comfort for your home and family while providing energy and cost savings.
If you happen to live in a hot and humid area of the country, you're also bound to face drainage problems with your unit since moisture can trap itself inside the system. Routine maintenance can cut down on drainage issues by cleaning out any mold or algae from blocking the drain. If you notice moldy smells whenever you turn the thermostat down, it's best to check on your system.
If your air conditioning system is not properly installed, it simply cannot be expected to operate at peak performance and efficiency levels. Make sure that your air conditioner is carefully selected and expertly installed so that you get the exceptional performance you deserve from it. Call now to schedule your AC installation with a skilled Issaquah air conditioning installation professional.

HVAC professionals in the US can receive training through formal training institutions, where most earn associate degrees. Training for HVAC technicians includes classroom lectures and hands-on tasks, and can be followed by an apprenticeship wherein the recent graduate works alongside a professional HVAC technician for a temporary period.[31] HVAC techs who have been trained can also be certified in areas such as air conditioning, heat pumps, gas heating, and commercial refrigeration.[32]
The selection of the working fluids (refrigerants) has a significant impact not only on the performance of the air conditioners but on the environment as well. Most refrigerants used for air conditioning contribute to global warming, and many also deplete the ozone layer.[59] CFCs, HCFCs, and HFCs are potent greenhouse gases when leaked to the atmosphere.

"Had T.N. Bowes replace our whole HVAC system. What a difference it makes! Using less energy and it maintains the temperature inside the house like a champ, and it’s quiet! Had quotes from all the major HVAC players in the area and T.N. Bowes couldn’t be touched. One day install, polite workers and no mess to deal with when they left! Thanks, Eric, for getting us our new system!"
The chill of winter can be a scary thought when your furnace needs repair. When the furnace in your home goes on the fritz, you need it fixed right away to keep your family safe and comfortable. Every BGE HOME technician is licensed and adheres to a stringent in-house certification program that guarantees their knowledge, affirms their commitment to the customer, and ensures excellence in completing every furnace repair with the highest level of quality.
A number of other variables can influence your decision on whether to repair or replace your furnace, as well. In addition to cost and brand, consider the expected lifetime of your furnace. If it is more than 15 years old, it might make more sense to invest in a new unit even if it costs more than simply repairing the current problem. Long-term costs also play into the equation. For example, your new furnace may be more energy efficient than the current unit. Even though you will pay more for the actual installation, you might be able to make back your investment through lower energy bills. To make your decision, consult with a reliable professional on what to do. In inspecting your furnace, they will be able to make an informed recommendation that looks not just to the next year, but years into the future. That way, you can make the best possible decision for your home and budget long-term.
Modern refrigerants have been developed to be more environmentally safe than many of the early chlorofluorocarbon-based refrigerants used in the early- and mid-twentieth century. These include HCFCs (R-22, as used in most U.S. homes before 2011) and HFCs (R-134a, used in most cars) have replaced most CFC use. HCFCs, in turn, are supposed to have been in the process of being phased out under the Montreal Protocol and replaced by HFCs such as R-410A, which lack chlorine.[14] HFCs, however, contribute to climate change problems. Moreover, policy and political influence by corporate executives resisted change.[15][16] Corporations insisted that no alternatives to HFCs existed. The environmental organization Greenpeace provided funding to a former East German refrigerator company to research an alternative ozone- and climate-safe refrigerant in 1992. The company developed a hydrocarbon mix of isopentane and isobutane, but as a condition of the contract with Greenpeace could not patent the technology, which led to its widespread adoption by other firms.[17][18][19] Their activist marketing first in Germany led to companies like Whirlpool, Bosch, and later LG and others to incorporate the technology throughout Europe, then Asia, although the corporate executives resisted in Latin America, so that it arrived in Argentina produced by a domestic firm in 2003, and then finally with giant Bosch's production in Brazil by 2004.[20][21]
An air conditioning system, or a standalone air conditioner, provides cooling and humidity control for all or part of a building. Air conditioned buildings often have sealed windows, because open windows would work against the system intended to maintain constant indoor air conditions. Outside, fresh air is generally drawn into the system by a vent into the indoor heat exchanger section, creating positive air pressure. The percentage of return air made up of fresh air can usually be manipulated by adjusting the opening of this vent. Typical fresh air intake is about 10%.
Dehumidification (air drying) in an air conditioning system is provided by the evaporator. Since the evaporator operates at a temperature below the dew point, moisture in the air condenses on the evaporator coil tubes. This moisture is collected at the bottom of the evaporator in a pan and removed by piping to a central drain or onto the ground outside.
Owning a home comes with so much responsibility. Finding the right professionals to help ease the burden of keeping up with the vital systems in your residence is important. When it comes to keeping your heating and cooling unit in good working order, you need to call on Deljo Heating & Cooling for help. We have been in the HVAC repair business for many years and will have no problem extending a helping hand when you need it. Hiring us will allow you to take advantage of a number of benefits.
Air Conditioning Parts is an international AC Parts distributor specializing in OEM wholesale A/C Parts for all air conditioner makes and models. All of our parts and equipment are available at factory direct pricing! For almost 30 years, our exceptional level of service and responsiveness coupled with our experienced air conditioning parts specialists have allowed us to establish solid long term relationships with thousands of A/C service companies, hotel and motel owners, apartment owners and management companies, and numerous other industry professionals who need and count on a knowledgeable AC parts supplier for the right part, overnight delivery and the best possible prices for all types of air conditioning parts and AC equipment. Professionals know they can depend on Air Conditioner Parts! Let us earn your trust. Call us for any A/C Part or any A/C Equipment at 800-525-3572.
First off, HVAC stands for “Heating, Ventilation, and Air Conditioning,” while AC stands for just the last part: “Air Conditioning.” In other words, when we talk about AC, we’re generally talking about the system that cools the air in your home (although sometimes people do use the term AC to refer to units that provide heat as well, especially when they’re talking about heat pumps). However, when we talk about HVAC, we could be talking about a system that does either the heating or the cooling, or both.
CIBSE publishes several guides to HVAC design relevant to the UK market, and also the Republic of Ireland, Australia, New Zealand and Hong Kong. These guides include various recommended design criteria and standards, some of which are cited within the UK building regulations, and therefore form a legislative requirement for major building services works. The main guides are:

A pinging or popping sound coming from the duct work can come from thermal expansion—the ductwork expanding and contracting as it heats and cools.  Or, air blowing past a loose flap of metal can make the sound. Track along the duct runs, listening for the sound. If you locate it, make a small dent in the sheet metal to provide a more rigid surface that’s less likely to move as it heats and cools.


Combustion gases are generated by the burners in your furnace and passed through a heat exchanger. Air from your home blows across the heat exchanger to be warmed. It is then blown through a system of ducts to distribute around your home. During warm seasons your heating system works with your central air conditioning. Air is cooled as it’s blown over your air conditioning unit’s cooling coil, often attached to the air circulating fan of the furnace, and then sent through the same air ducts throughout your home.
A packaged system is a single unit combining all the components described in the split system. Since the unit is a package, it must be placed outside the building and indoor air is “ducted” from the building to the packaged system and back through an air distribution system. These units typically have SEER rating from 10 to 18. If heating is required, an alternate method of heating the interior of the building must be used, usually in the form of electric or gas heating.
Yes. You should expect to pay a diagnostic fee to cover the cost of the technician's visit, the diagnosis of your air conditioner's problem, and a quote for the repair options. You will be advised of the issue along with recommended options to correct it, which may include a system replacement if your unit is old or significantly damaged. If you decide to replace the system, the diagnostic fee will be credited toward your replacement purchase.
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