If you have just moved to Arizona and to Marana, or if you are uncertain about getting your A/C taken care of regularly by an air conditioning repair company like D&H, are you aware of the 5 reasons why your A/C needs to be maintained regularly, once before summer and once before winter?

I. 5 reasons why maintenance matters (not just to avoid A/C repairs)

1. Health: Regular A/C service maintains a healthier indoor environment. Most newcomers to Arizona are surprised to see that a very fine dust accumulates on their furniture really fast. Before summer, we also see pollens coming into our homes. Many of us have allergies, so it’s better to take care of the indoor air quality before the season.
Your air conditioning unit accumulates this dust and pollens even faster because it is located outside, and it sucks a lot of dust both inside and outside.
During maintenance, D&H’s HVAC technicians clean your system thoroughly, inspect all its parts, and change your air filters. This helps minimize the presence of allergens and dust.

2. Comfort: A well-maintained air conditioning system provides more consistent temperatures throughout your home. Maintenance is not the only factor, of course. But when people let their A/C unit run without proper maintenance, the motors inside have a hard time operating optimally. Your A/C wastes a lot of energy trying to cool down the house just because it’s not “breathing” correctly.
During maintenance, D&H’s technicians assess the efficiency of your system, calibrate thermostats, and verify proper airflow.

3. Power usage: When air conditioning service is not done regularly, your system can’t reach your target indoor temperature without consuming extra power.
The SEER number on your unit is an indication of its efficiency: how much energy does it consume to produce that much air conditioning at a given temperature. Californian homeowners are very aware of this rating because of the very strict state regulations on air conditioning units.
In Arizona, the SEER number decreases every year by about 0.5-1.0 point on average IF the system is regularly maintained. When service is not done twice a year, its SEER decreases even faster.
So your utility bills just increase uselessly just because youe A/C has to work much harder to cool down your home.

4. System wear and tear: When an air conditioner is not properly serviced, the wear and tear goes unnoticed. Wear and tear is inevitable. But if it goes unnoticed, it creates breakdowns in the system. These breakdowns create other critical issues (it’s a “domino effect”). Before you know it, you are calling us for an emergency a/c repair.
D&H’s HVAC technicians inspect carefully all the parts of your system to detect signs of wear and tear. With your authorization, we perform the necessary repairs on the spot, except when a critical failure on an old system requires parts that are not readily available from the manufacturer. In this case, we get it through our nationwide network of part suppliers and rush it to your home as fast as possible.

5. Manufacturer’s warranties: Many HVAC manufacturers require that homeowners schedule regular maintenance with a professional HVAC contractor to maintain their equipment warranties. Their warranties usually cover the cost of replacement parts and the technical labor associated if a system malfunction is due to a manufacturing defect. But many people don’t know that if they don’t get their air conditioning serviced regularly by a professional HVAC contractor like D&H, the manufacturer may void their warranties. Then the cost of replacing the parts is all yours and these are costly parts.
Schedule your A/C service twice a year with a licensed HVAC contractor. This will keep your warranty coverage valid, protect your finances, and give you peace of mind for not much money.

II. What is a proper HVAC system of an average home in Marana?

According to Zillow, the median size for a home in Marana was about 2000 sq.ft. in 2021. The question is what is a
proper HVAC system for a regular home of this size?

We try to answer this question by listing 5 features you should be aware of when selecting a new air conditioning
system. This is not a complete list: if you want a way more complete explanation, please call our Comfort
Consultants to schedule a complimentary consultation at your home.

1. Optimal efficiency: All air conditioning systems work more or less on the same principles. They are different from each other by the level of technology they use, their size and their capabilities. An efficient A/C system will be more than capable of heating and cooling the volume of air in your home. This is called the “cooling load”, and it is calculated using the “Manual J load calculation method”, which considers factors such as insulation, window size, and orientation, among others. An undersized system will struggle to maintain the desired temperature; it will have to run continuously and therefore consume more energy. A single-speed motor will start/stop based on the indoor temperature moving above/below your target temperature. It will be less efficient than a variable speed motor, which make constant small adjustments and run more efficiently with a lower pull on the power grid throughout the day. So you see that the first questions to ask to an HVAC consultant have to do with how they match the A/C system to the size of your home, and how the A/C system they want to recommend will save on your utility bills with technologies that use less power.

2. Comfort: A good HVAC system well adapted to your home will provide consistent and even temperatures throughout it. This does not just depend on the A/C unit, unfortunately (it would be too simple!). It also depends on the way your duct system is installed, and on the weather exposure of the various rooms. You know the problem: your bedroom with its big panoramic window is much warmer than your living room during the Arizonan spring and summer.
HVAC consultants use the principle of “zones” and they look at how your home is built to design a system that creates this evenness in temperatures. Technically, it is generally accepted that differences in temperatures from one room to another should be no more than 5°F. Beyond, you get hot and cold spots, and insufficient air circulation. So your next set of questions to your HVAC consultant should cover the way the proposed system equalizes indoor temperatures.

3. Humidity/dryness control: In a dry climate like that of Southern Arizona, you have to maintain an appropriate level of indoor humidity to feel comfortable and to avoid breathing issues. In general, indoor humidity levels should range from 30% to 50%. Dry air is not healthy, especially when there is dust in suspension.
A good HVAC system will effectively manage humidity levels by removing excess moisture from the air during the cooling process, but letting enough humidity to keep you comfortable. Too much humidity is bad for molds; too much dryness creates dehydration. Both are bad. So your questions to your HVAC consultant should also cover the degree of hygrometry in your home, and how the HVAC system handles it.

4. System longevity: Undersized A/C units must run longer to reach your target temperature. They get additional wear and tear and age prematurely. Componenets have to be replaced more frequently. Compressors are highly solicited by constant starts and stops. They wear down faster. This is also accelerated by the weather. In Marana, A/C systems are not only constantly exposed to the harsh sun; they are also exposed to rain during the monsoons (though much less than in Vail or Coronado de Tucson). And they suffer from the cold weather during winter nights. All these quick changes in temperatures and exposure to elements create fatigue on rubber insulation, expansion and contraction of metal, scratching and corrosion of paint. A good HVAC system will be made specifically for the desert environment of Southern Arizona. The HVAC consultant must be aware of the differences between systems well-suited to Arizona, and other systems better suited to Florida, for example. To get maximum longevity for your system you need to be sure it is adapted to this weather.

5. Proper air filtration: A correctly sized HVAC system will allow for efficient air filtration, ensuring that the air circulating in the home is clean and free of pollutants, allergens, and other contaminants. An undersized system may struggle to move air through the filters at the proper rate, reducing filtration efficiency and allowing pollutants to accumulate in the home. This can be especially concerning for those with allergies or respiratory issues.

Why HVAC units designed for humid climates are not suitable for Southern Arizona

1. Different cooling requirements: HVAC systems designed for humid climates, like Florida, Georgia, or Alabama, are engineered to remove excess moisture from the air while cooling the space. In contrast, Southern Arizona has a dry climate, and the primary concern is cooling the air without inadvertently increasing the humidity. An HVAC system designed for a humid climate may not provide the optimal balance of cooling and humidity control needed in Arizona. For instance, a system with a high Sensible Heat Ratio (SHR) is more suitable for arid climates, as it prioritizes sensible cooling over latent cooling (dehumidification).

2. Variable-speed compressors: HVAC units designed for humid climates often feature variable-speed compressors that can adjust their output according to the humidity levels. While this feature is beneficial in a humid climate, it may not be necessary in Southern Arizona and can result in increased energy consumption and higher operating costs. A system with a single-speed or two-stage compressor, which is designed to operate efficiently in dry climates, can better meet the cooling demands of homes in Arizona.

3. Dehumidification capabilities: HVAC systems built for humid climates prioritize dehumidification, often incorporating advanced features like humidity sensors and enhanced evaporator coil designs with lower fin density. These features are not required in dry climates like Southern Arizona and can lead to an unnecessarily complex and costly system. Instead, a system with a high SHR and minimal dehumidification capabilities would be more appropriate for the region’s climate conditions.

4. Inefficient operation: An HVAC system designed for a humid climate may not be as energy-efficient in a dry climate like Southern Arizona. This can result in higher energy bills and increased greenhouse gas emissions. For example, a system with a SEER rating of 16 operating in a humid climate may consume less energy than the same system operating in a dry climate due to differences in cooling demand and dehumidification needs. Selecting an HVAC system specifically designed for the climate in Southern Arizona will ensure optimal efficiency and lower operating costs.

5. Refrigerant selection: HVAC systems designed for humid climates may use refrigerants optimized for dehumidification, such as R-410A, which has excellent performance in high-humidity environments. However, in dry climates like Southern Arizona, other refrigerants like R-32, which provide better energy efficiency and lower global warming potential (GWP), may be more suitable. Choosing an HVAC system with a refrigerant optimized for dry climates can lead to improved performance and environmental benefits.

Marana, Arizona is a growing town located northwest of Tucson in Pima County. Although it is a relatively small town, it has several neighborhoods, each with its own unique character. Here is an overview of the main neighborhoods in Marana, AZ:

1. Continental Ranch:

  • Location: Northwest Marana
  • Type: Primarily residential
  • Distance from downtown Tucson: About 15 miles
  • Topography: Relatively flat terrain with views of the nearby Tucson Mountains

Continental Ranch is a family-friendly, master-planned community in northwest Marana. The neighborhood is primarily residential, with a mix of single-family homes and townhomes. It is conveniently located near the intersection of I-10 and Cortaro Road, providing easy access to downtown Tucson.

2. Gladden Farms:

  • Location: West Marana
  • Type: Primarily residential
  • Distance from downtown Tucson: About 23 miles
  • Topography: Mostly flat with views of the Tortolita Mountains

Gladden Farms is a newer, master-planned community in west Marana. It features a range of single-family homes, parks, and walking trails. The neighborhood is located near the Marana Center, which offers shopping, dining, and entertainment options.

3. Dove Mountain:

  • Location: North Marana
  • Type: Primarily residential and resort community
  • Distance from downtown Tucson: About 25 miles
  • Topography: Foothills of the Tortolita Mountains

Dove Mountain is an upscale, master-planned community in north Marana. It is nestled in the foothills of the Tortolita Mountains and offers luxury homes, as well as the Ritz-Carlton Dove Mountain resort. The neighborhood features several golf courses, hiking and biking trails, and beautiful desert scenery.

4. Twin Peaks:

  • Location: Central Marana
  • Type: Mixed-use (residential, commercial, and industrial)
  • Distance from downtown Tucson: About 20 miles
  • Topography: Relatively flat terrain with views of the Tucson Mountains

Twin Peaks is a mixed-use neighborhood in central Marana, featuring residential, commercial, and industrial areas. It is located along Twin Peaks Road and I-10, offering easy access to both Tucson and Marana’s amenities. The neighborhood includes single-family homes, apartments, and townhomes, as well as shopping centers and business parks.

5. Heritage Highlands:

  • Location: North Marana
  • Type: Primarily residential (active adult community)
  • Distance from downtown Tucson: About 26 miles
  • Topography: Foothills of the Tortolita Mountains

Heritage Highlands is an active adult community (55+) located in north Marana, within the larger Dove Mountain area. It offers a variety of amenities, including a golf course, clubhouse, swimming pool, and tennis courts. The neighborhood is surrounded by stunning desert landscapes and mountain views.

6. Silverbell Place:

  • Location: Central Marana
  • Type: Primarily residential
  • Distance from downtown Tucson: About 16 miles
  • Topography: Relatively flat terrain with views of the Tucson Mountains

Silverbell Place is a residential community in central Marana, located along Silverbell Road. It consists of single-family homes and offers a quiet, suburban atmosphere. The neighborhood is close to local parks, schools, and shopping centers, providing convenience for families.

7. San Lucas:

  • Location: West Marana
  • Type: Primarily residential
  • Distance from downtown Tucson: About 22 miles
  • Topography: Mostly flat with views of the Tortolita and Tucson Mountains

San Lucas is a master-planned community in west Marana. The neighborhood features single-family homes and townhomes, as well as parks, walking trails, and a community lake. San Lucas is located near the Marana Center, offering access to shopping, dining, and entertainment options.

8. Rancho Marana:

  • Location: West Marana
  • Type: Primarily residential
  • Distance from downtown Tucson: About 24 miles
  • Topography: Mostly flat with views of the Tortolita and Tucson Mountains

Rancho Marana is a residential community in west Marana, located near the Marana Center. The neighborhood offers single-family homes with various floor plans and sizes, catering to a diverse range of homebuyers. Residents enjoy easy access to shopping, dining, and entertainment options in the area.

Air quality data for Marana, Arizona

Air quality is typically monitored by local, state, and federal agencies. In Arizona, the primary agency responsible for monitoring air quality is the Arizona Department of Environmental Quality (ADEQ).
ADEQ operates a network of air quality monitoring stations across the state to measure levels of pollutants such as ozone, particulate matter, carbon monoxide, nitrogen dioxide, and sulfur dioxide.
To find the most up-to-date air quality information for Marana, you can visit the ADEQ’s website or check the U.S. Environmental Protection Agency’s (EPA) AirNow website. The AirNow website provides real-time air quality index (AQI) information for locations across the United States, including Arizona.
Keep in mind that Marana is located in Pima County, so you can search for air quality information for the county or nearby Tucson for a more accurate picture of the local air quality.
It’s important to note that air quality can vary depending on factors such as weather conditions, time of day, and seasonal patterns. To ensure you have the most accurate and up-to-date information, it’s best to consult official air quality monitoring resources.

Marana has generally been proactive in implementing sustainability measures and addressing environmental concerns. Some of these efforts may indirectly help combat pollution.
For instance, the Town of Marana has a Water Conservation Program that encourages residents and businesses to use water resources more efficiently. By promoting water conservation and reusing reclaimed water for irrigation, the town aims to reduce the demand on local water resources.
Additionally, Marana supports recycling programs and waste reduction efforts to minimize the impact on the environment. The town has partnered with Waste Management to provide residential curbside recycling services, which help divert waste from landfills and reduce pollution.
Marana has also invested in improving transportation infrastructure, such as the construction of multi-use pathways and bicycle lanes. These efforts can promote alternative transportation methods, reducing vehicle emissions and traffic congestion.


Here is a view of Marana’s weather based on the general patterns of the past 15 years, season by season.

Spring (March – May)
Spring is a delightful season in Marana, as temperatures start to rise and the desert blooms with colorful wildflowers. Daytime highs range from the upper 60s in early March to the upper 80s by late May, while nighttime lows are typically in the 40s and 50s. This season is perfect for enjoying outdoor activities, such as hiking, picnicking, and exploring local parks.
Although spring is generally dry, Marana may experience occasional rain showers, particularly in March and April. It’s a good idea for moms to keep an eye on the weather forecast and pack a light jacket or umbrella, just in case. As temperatures rise, it’s also essential to keep children well-hydrated and protected from the sun with hats, sunscreen, and ample shade.

Summer (June – August)
Summer in Marana brings hot temperatures, with daytime highs frequently surpassing 100°F. Nighttime lows can range from the upper 60s to mid-70s, offering some relief from the heat. While this season can be challenging for outdoor activities, it’s still possible to enjoy Marana’s natural beauty by planning early morning or late evening outings when the temperatures are more manageable.
Monsoon season typically begins in early July and lasts through mid-September. During this time, Marana may experience sudden thunderstorms, heavy rainfall, and flash floods. To ensure the safety of your family, it’s essential to stay informed about local weather alerts and avoid low-lying areas prone to flooding.
To beat the heat, consider visiting one of Marana’s many indoor attractions, such as museums, movie theaters, or shopping centers. Alternatively, take advantage of local swimming pools or splash pads to help your children cool off and have fun.

Fall (September – November)
Fall in Marana is characterized by gradually cooling temperatures and a return to drier weather. Daytime highs range from the 90s in September to the mid-70s by November, with nighttime lows dipping into the 40s and 50s. This season is an ideal time to explore Marana’s outdoor attractions, as the weather is generally pleasant and mild.
With the arrival of fall, the risk of monsoon storms diminishes, allowing for more predictable outdoor plans. However, it’s always wise to check the weather forecast before venturing out, as occasional rain showers can still occur. As the days grow shorter, remember to pack extra layers for early morning and evening outings when temperatures can drop significantly.

Winter (December – February)
Winter in Marana is relatively mild, with daytime highs ranging from the low 60s to upper 60s and nighttime lows in the upper 30s to low 40s. While snow is rare, it’s not unheard of, particularly in the nearby mountain areas. This season is perfect for enjoying scenic drives, birdwatching, and hiking in the lower elevations.
Although temperatures are generally comfortable during the day, it’s essential to dress in layers and bring warm clothing for the colder evenings. Moms should also be prepared for the possibility of rain or even occasional snow flurries, as winter is Marana’s second wettest season.