Denver HVAC Repair

We’re here to make your life a lot less hectic, and a lot more productive. As a local HVAC and Mechanical Contractor, MacDonald-Miller is committed to delivering true peace of mind. We perform regular inspections and maintenance of your building systems to ensure a greater level of operational excellence. We test, align, calibrate, and record performance to ensure your building’s equipment quality and reduce downtime or emergencies. When it comes to dedicated HVAC service & maintenance, MacDonald-Miller is unmatched.
In 2006, a new HVAC rule went into affect for residential air conditioners, requiring all to have a Seasonal Energy Efficiency Ratio (SEER) of 13 or higher. As you might expect, the more efficient the unit is (or newer), the lower your average AC repair cost will be. Keep in mind, if for some reason your high-efficient repair bill is high, you’re still saving on energy costs every month through your electric and gas bills. 

Maintaining your air conditioner (HVAC) unit will ensure that it’s ready to properly cool your home all throughout the summer. Keeping your unit in good condition is also important for your wallet: lack of maintenance shortens a unit’s lifespan by 10-15 years, meaning you’ll need to buy a new one sooner. Lack of maintenance also results in a 5% efficiency loss, which results in higher energy bills. 


Before opening the electrical cover on the A/C unit, be sure to shut off all power to the compressor unit and the indoor furnace or air handler, and verify that it is off. Note that this may mean shutting off a circuit breaker that serves the furnace and air handler, and then, near the compressor, pulling out the disconnect block (or shutting off the 220-volt power) to the outdoor compressor.
A dehumidifier is an air-conditioner-like device that controls the humidity of a room or building. It is often employed in basements which have a higher relative humidity because of their lower temperature (and propensity for damp floors and walls). In food retailing establishments, large open chiller cabinets are highly effective at dehumidifying the internal air. Conversely, a humidifier increases the humidity of a building.
The most recognized standards for HVAC design are based on ASHRAE data. The most general of four volumes of the ASHRAE Handbook is Fundamentals; it includes heating and cooling calculations. Each volume of the ASHRAE Handbook is updated every four years. The design professional must consult ASHRAE data for the standards of design and care as the typical building codes provide little to no information on HVAC design practices; codes such as the UMC and IMC do include much detail on installation requirements, however. Other useful reference materials include items from SMACNA, ACGIH, and technical trade journals.
We service and install forced air systems from all manufacturers, including Trane, Burnham, Heil, Rheem, and many more. If your home needs a new system, we will recommend the best system for your needs and budget. If you have a brand preference, we can recommend and provide qualified installation of a system from that company that fits your home’s needs.
The 2nd-century Chinese mechanical engineer and inventor Ding Huan of the Han Dynasty invented a rotary fan for air conditioning, with seven wheels 3 m (10 ft) in diameter and manually powered by prisoners of the time.[6] In 747, Emperor Xuanzong (r. 712–762) of the Tang Dynasty (618–907) had the Cool Hall (Liang Dian 涼殿) built in the imperial palace, which the Tang Yulin describes as having water-powered fan wheels for air conditioning as well as rising jet streams of water from fountains. During the subsequent Song Dynasty (960–1279), written sources mentioned the air conditioning rotary fan as even more widely used.[7]
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Plus, when it comes to heating and air conditioning maintenance and repair in San Diego homes, Bill Howe offers affordable pricing to provide you with everything that you need without breaking the bank. So, whether you find yourself with an inoperable AC unit that needs a complete replacement or you just want an annual tune-up, we are here for you. After all, we have specialized in heating and cooling San Diego for quite some time, and no problem is too big or small for us.
1/18/2014 Hi Jody M-  First, as you pointed out, we were the "Only" company to answer your phone call on the… Hi Jody M-  First, as you pointed out, we were the "Only" company to answer your phone call on the weekend & provide service for you on the same day. There is a premium for most any service company to come out afterhours or weekends, and being we are one of the very few companies to offer this service, a higher labor rate is understandable, after all, we have to pay our service persons an overtime rate for such calls.          

Change the filter: A new filter can cost as little as $20. Since this is the most effective way of maintaining your AC system, there is no reason not to change your filter. Homeowners should change your AC filters whenever it gets dirty. Depending on the filter, you may have to change it once every six months or once every month. Each filter should indicate how long it will last.

Most modern air-conditioning systems feature a dehumidification cycle during which the compressor runs while the fan is slowed as much as possible[citation needed] to reduce the evaporator temperature and therefore condense more water. When the temperature falls below a threshold, both the fan and compressor are shut off to mitigate further temperature drops;[clarification needed] this prevents moisture on the evaporator from being blown back into the room.[citation needed] When the temperature rises again,[clarification needed] the compressor restarts and the fan returns to low speed.


We offer 24-hour emergency service, with no overtime charges. Our fully stocked trucks with thousands of specialty parts and materials on board are ready to serve you and fix your heating or air conditioner problem on the first call. And when your family's health, safety, and comfort are involved, that means peace of mind. Quality service is important to our clients, and our goal is to ensure that your needs are met when heating or air conditioning issues that arise.
Air conditioning makes deep plan buildings feasible, for otherwise they would have to be built narrower or with light wells so that inner spaces received sufficient outdoor air via natural ventilation. Air conditioning also allows buildings to be taller, since wind speed increases significantly with altitude making natural ventilation impractical for very tall buildings.[citation needed] Comfort applications are quite different for various building types and may be categorized as:
“We had a great experience with Robinson’s! The office staff, then the gentleman who helped me with questions over the phone and Kyle, our service tech, were all great and very easy to work with. They gave me a time frame for when to expect Kyle the same day. A phone call to let me know he was on his way. A text with picture so I knew who to be expecting. Kyle arrived on time and was very knowledgeable and friendly. He did a great job. You could tell he liked his job. Prices were reasonable. We will be using and recommending Robinson’s Air – Wichita Falls in the future.”

If the condenser coils are clogged, the compressor can overheat and shut down. You’ll experience intermittent periods of minimal cooling, followed by no cooling. Even if you’re “sure” the condenser coils are clean, clean them again. Turn off the power. Flip the air conditioning service and furnace circuit breakers in your main electrical panel to the “Off” position. Next, turn off the power switch right at the furnace or air handler. Then yank the disconnect block (Photo 1) and clean the condenser coils (Photo 2). If the air conditioning service still doesn’t work properly after you’ve cleaned the condenser coils, installed a new filter and opened all the supply vents, proceed with the following repairs.
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