Less dust, fewer allergens, air that does not dry you out. Filtration, purification and humidity control fitted to your existing system.
Serving Phoenix, AZ
# ROC 102297
Rated by BBB
Phoenix homes have three specific indoor air problems, and they are different from the ones the rest of the country deals with. Fine desert dust that gets through standard filters. Very dry air for most of the year. And a house that stays closed with the AC running for five months, recirculating the same air.
CMI-AIR fits filtration, purification and humidity equipment to systems we already service. That matters, because indoor air quality equipment that is not matched to the airflow of your specific system either underperforms or strains the blower.
Dust, dryness and recirculation. In that order.
Desert dust and fine particulate. Valley dust is finer than typical household dust, which means a standard one-inch filter rated MERV 8 lets a good deal of it through. It settles on furniture, it coats the evaporator coil, and it loads filters faster than the replacement interval on the box assumes. Dust storm season makes it worse for days at a time.
Very low humidity. Phoenix indoor humidity often sits below 20 percent in winter. That produces dry skin, irritated sinuses, static, cracking wood floors and furniture, and it makes the same temperature feel colder than it is.
A closed house for five months. From May through September, windows stay shut and the AC recirculates. Cooking odors, pet dander, off-gassing from finishes and cleaning products all accumulate because nothing is diluting them with outside air.
Ductwork condition. This is the one homeowners overlook. If the ducts have dust and debris in them, every cycle pushes some of it back into the rooms. No filter at the air handler fixes contamination that is downstream of it.
Whole-home humidifiers for the dry months, and dehumidification where a system is not pulling enough moisture during monsoon season.
If the ducts are dirty, filtration alone will not solve it. Duct cleaning is handled through our ductwork services.
No, and this is the most common indoor air quality mistake in Phoenix homes.
A filter’s MERV rating tells you how small a particle it captures. A higher rating captures more. It also restricts airflow more, and residential HVAC blowers are designed for a specific range of static pressure. Put a MERV 16 filter in a system built for MERV 8 and you get less airflow, worse cooling, a colder evaporator coil that can freeze, and a blower motor working harder than it was designed to.
The right answer is the highest filtration your specific system can handle without exceeding its static pressure limit. Sometimes that means a better filter in the existing slot. Sometimes it means a wider media cabinet, which gives you more filter surface area and therefore high filtration at low resistance. Which one applies depends on your equipment and your duct sizing.
We measure static pressure before recommending a filter. That is the difference between fitting filtration and just selling a filter.
Filtration happens at the air handler, so it treats every cubic foot the system moves before it reaches the rooms. That is the difference between it and a portable purifier, which only cleans the room it is standing in.
A deeper filter housing fitted at the air handler, taking a four or five inch pleated media filter. More surface area, better filtration, much less airflow restriction than a high-MERV one-inch filter, and a replacement interval measured in months rather than weeks. For most Phoenix homes with a dust complaint, this is the recommendation.
Where the duct system and blower can support it, filtration that captures fine particulate down into the range that matters for allergens. Feasibility comes down to static pressure, so this is a measurement question rather than a preference.
Equipment installed in the duct system that treats air as it passes rather than trapping particles. Useful alongside good filtration, not instead of it.
Where the complaint is smell rather than dust. Particulate filters do very little for odour, and carbon media is the part that does.
UV is installed at the coil to keep biological growth off it, and it is genuinely good at that specific job. Claims about UV cleaning the air of the whole house as it passes are much weaker, because contact time at duct velocity is very short. We will fit UV for coil protection and say so honestly rather than selling it as air purification.
Two houses on the same street can need different filtration, and it comes down to what the duct system will allow.
A house with generously sized ducts and a variable-speed blower can carry high-efficiency filtration with no performance penalty. A house with undersized returns and a single-stage blower already running near its static pressure limit cannot, and putting a restrictive filter in it makes the cooling worse. Same filter, same brand, two different outcomes.
So the visit starts with a static pressure reading and a look at the return sizing. If the ducts are the constraint, the honest recommendation is often to fix the ducts first, which improves the cooling as well as making better filtration possible.
Sometimes, and it is worth being clear about what testing does and does not tell you.
Testing is worth doing when someone in the home has symptoms that track with being indoors, when there has been water damage and mold is a question, or when there is a persistent odor with no obvious source. In those cases the result changes what you should do.
Testing is not worth much when the complaint is dust, and dust is the most common complaint in this market. If your house is dusty in Phoenix, a test will confirm there is dust. The useful next step is looking at filtration, duct condition and whether the system is drawing unfiltered air from an attic or crawlspace through leaks on the return side. That last one is common and it is a real fix.
Call (602) 437-0066 or use the form and tell us what you are noticing. Dust, smells, dry air, allergies. The symptom points to the fix.
Three usual causes. The filter is not fine enough for Valley dust, or it is overdue for replacement. The return side of the duct system is leaking, which pulls unfiltered attic or crawlspace air into the system and past the filter. Or the ducts themselves hold dust that gets pushed back into rooms on every cycle. All three are fixable, and which one it is can be determined by inspecting the system.
Whole-home units installed in the duct system do measurable work on particulate, and that is well established. Claims about eliminating viruses, odors or mold vary a great deal by technology and some are overstated. We will tell you what a given piece of equipment is good at and what it is not, and we would rather fix filtration and duct leakage first, because that is where most of the improvement in a Phoenix home comes from.
The highest your system can handle without going over its static pressure limit, which is specific to your house and not something anyone can tell you over the phone. For a lot of Phoenix homes with a one-inch slot that lands around MERV 11, and going higher needs a media cabinet rather than a more restrictive filter in the same slot.
For keeping biological growth off the evaporator coil, yes, and that is a worthwhile job. For sterilising the air of the whole house as it passes the lamp, the evidence is much weaker, because air moves past the light too quickly for meaningful exposure.
For one room it can be, and a good portable unit in a bedroom is a reasonable thing to own. It does nothing for the rest of the house and nothing about dust circulating through your ductwork. They solve different problems and there is no reason not to have both.
If your indoor humidity drops below 20 percent in winter and you are dealing with dry skin, sinus irritation, static or wood furniture and flooring drying out, then yes. Phoenix is one of the better cases for one anywhere in the country. It runs during the heating months and stays off the rest of the year.
More often than the box says. A one-inch filter that a manufacturer rates for 90 days often needs replacing at 30 to 60 days here, faster with pets or during dust storm season. Check it monthly and go by what it looks like rather than the calendar. Thicker media filters last considerably longer.
It helps when the ducts are genuinely dirty, and in Phoenix homes over [15] years old they often are. It is not a fix for a dust problem caused by poor filtration or duct leakage, because those keep refilling the ducts. Sequence matters: seal the leaks, get the filtration right, then clean, and the result lasts.
Usually yes. Most filtration and humidity equipment installs into the existing ductwork at the air handler. What determines feasibility is the space available at the equipment and whether your system’s airflow can accommodate it, which is what we check on the visit.
CMI-AIR is the residential division of Consolidated Mechanical, a local, family-owned commercial air conditioning company with more than 30 years of experience.
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