Waller's Plumbing and HeatingVisit Website →
← Back to blog

Indoor Air Quality and Allergies: A New Mexico Homeowner's Guide

November 9, 2026
Indoor Air Quality and Allergies: A New Mexico Homeowner's Guide

If your sneezing, itchy eyes and stuffy nose follow you indoors, the cause is usually something in the house: mold, dust mites, pet dander, pests or pollen that came in with the breeze. The fixes are mostly the same few steps. Remove the source, control moisture, keep the HVAC system and its filter in good shape, and filter the air that remains. This guide walks through each one for homes in Albuquerque, Rio Rancho, Corrales and the rest of New Mexico.

Waller's Plumbing and Heating, Inc
Get Help With Leaks or HVAC
Waller's handles plumbing repairs and HVAC maintenance for New Mexico homeowners, including issues that can affect indoor comfort.
Book a service request

TL;DR

  • The American Academy of Allergy, Asthma & Immunology lists dust-mite droppings, animal dander, cockroach droppings and molds as common year-round indoor allergens.
  • Source control comes first: fix leaks, clean up moisture, control pests and clean regularly. Filtration supplements that work.
  • For your HVAC filter, EPA recommends MERV 13 or the highest rating your system's fan and filter slot can handle.
  • Keep indoor humidity between 30% and 50%, and close windows during peak pollen.
  • A leak, a musty smell or a system that struggles with a new filter is worth a professional look.

Table of Contents

Why allergies can feel worse inside your home

We tend to think of allergies as an outdoor problem. But your home is where you spend the most hours, and it is where allergens settle, build up and recirculate. Bedding, carpet and upholstery hold dust mites. Damp corners grow mold. Pets shed. Pollen rides in on clothing, on fur and through open doors.

The EPA's overview of biological contaminants names mold, dust mites, pollen, pet allergens and pests such as mice and cockroaches as the common biological triggers. It says they can get in through windows, doors, poorly maintained ventilation systems, plumbing, and cracks or holes in the building. People and pets can also track or shed them inside.

Common indoor allergens and how they enter homes

That list includes two things we work on every day: plumbing and ventilation systems. A slow leak behind a wall and a neglected air handler are both quiet ways to feed an indoor allergy problem.

The usual suspects, room by room

Bedrooms: dust mites

Dust mites thrive on dead skin cells and live in bedding, carpeting and upholstery, according to New Mexico State University. Because you sleep with your face close to the mattress and pillow for hours, exposure is concentrated in the bedroom. That is why the AAAAI's advice focuses on bedding, mattresses, carpeting and bedroom humidity.

What the medical sources suggest:

  • Mayo Clinic recommends encasing mattresses, box springs and pillows, and washing bedding at least weekly in water heated to at least 130°F.
  • Mayo Clinic also suggests reducing carpeting and using a vacuum with a small-particle or HEPA filter.
  • The Asthma and Allergy Foundation of America recommends vacuuming carpets weekly and keeping pets out of bedrooms.

One note on that 130°F laundry advice: it is a washing temperature, and it is also a scald risk at the tap. If you have small children or older adults in the home, talk with a licensed plumber before changing your water heater setting, so you get hot laundry water without creating a burn hazard.

Bathrooms, kitchens and laundry rooms: mold

New Mexico State University notes that mold, mildew, fungi and bacteria are often found in high-humidity areas such as bathrooms, kitchens and laundry rooms. Its advice is simple: keep the home clean and dry.

Exhaust fans do much of that work. If yours is weak, noisy or vents into the attic, it deserves attention. A guide to choosing a bathroom fan that works covers what to look for in a ventilation fan for rooms where mold tends to appear.

Living areas: pet dander, pollen and pests

Pet dander and pollen settle into soft furnishings and carpet. EPA's guidance is to vacuum carpets and fabric-covered furniture, damp-dust and mop, and wash household linens. Pests such as cockroaches and mice leave droppings that are allergens too, so sealing cracks and controlling pests is part of an allergy plan.

Moisture is the lever you can pull

EPA's hierarchy puts source control first: remove moisture, pests, smoke and other sources, then ventilate with outdoor air when conditions permit, and use filtration to supplement both. If you do only one thing, find and fix moisture.

In a dry state like ours, that can sound unnecessary. But moisture shows up in New Mexico homes in specific ways:

  • Plumbing leaks. A pinhole in a supply line, a failing shutoff valve or a seeping water heater can keep a cabinet or wall cavity damp for months.
  • Condensation. Mayo Clinic advises cleaning mold and condensation from window frames.
  • Monsoon season. Late summer humidity can push indoor moisture up in homes that are normally dry.
  • Evaporative cooling. Lawrence Berkeley National Laboratory reports that dust mites may be absent from homes in high-altitude dry environments, while evaporative coolers can raise indoor humidity and dust-mite allergen levels. If you run a swamp cooler, keep an eye on humidity during monsoon season, and know that changing over to refrigerated air is an option we handle.

How much does humidity matter? The same LBNL page says dust-mite allergen levels generally rise with indoor humidity, and mites do not survive when relative humidity stays below about 50% for an extended period. AAFA recommends keeping indoor humidity between 30% and 50%. A simple hygrometer from a hardware store lets you see where you stand.

Moisture also travels through the building envelope. A look at how insulation controls moisture in your home explains how damp spaces and humidity contribute to mold growth and indoor allergens.

Finding a hidden leak

If you see staining, smell mustiness near a wall, or your water bill creeps up without explanation, do not wait for visible mold. Our leak detection service exists for exactly this. We also have a write-up on leak detection methods and one on how to find a water heater leak.

Your HVAC system and filter: what to know

Your heating and cooling system moves all the air in your home through one place, the filter. That makes it your best tool for whole-house filtration, and the place where a neglected system can spread problems around.

Pleated filter at a home return grille

MERV rating for allergies

MERV measures how well a filter captures particles between 0.3 and 10 microns. Higher ratings generally capture more. EPA's guidance is to use MERV 13 or the highest rating your system's fan and filter slot can accommodate, consult an HVAC professional if needed, and replace filters on the manufacturer's schedule.

MERV choiceWhat to know
MERV 13EPA's recommended target for most systems that can handle it
Below 13Fine if that is all your blower and filter slot can handle; ask a pro about options
Above 13Only if the equipment is designed for the added airflow resistance

Check before you upgrade

Higher-MERV filters resist airflow more. EPA's filtration bulletin says filter cabinets, ducts, filter width and blower limits must be considered so pressure drop does not exceed what the system can handle.

The same bulletin says a dirty or clogged filter can reduce airflow and increase furnace runtime, motor wear and energy use. So a better filter is only a better filter if you change it on time.

Before you buy a MERV 13 box:

  1. Find your current filter's size and rating printed on its frame.
  2. Check the filter slot depth. Thicker media filters usually give the system more surface area than thin ones.
  3. Look at your system's manual or ask a technician whether the blower is designed for a higher-rated filter.
  4. Set a reminder to inspect the filter monthly and replace it on schedule.

We cover timing in how and when to change home filters in New Mexico. Our region's dust, pollen and cooling season shape how often that is.

A musty smell is a signal

If the air coming from your vents smells musty, treat it as information. Our guide on what to do when your AC smells musty lists safe first steps and when to call us. Spring tune-ups help too: our AC maintenance checklist covers tasks you can do before the first heat wave.

Should you use a portable air purifier?

Possibly, as a supplement. EPA's guide to air cleaners says studies of portable HEPA cleaners have found improvements in one or more allergy or asthma symptoms, though results are inconsistent. It also says portable cleaners serve a single room, while central HVAC filters can filter recirculated air throughout a home. Neither removes every pollutant.

If you buy one, the guidance is consistent:

  • Choose a unit with a CADR suited to the room. Health Canada's sizing rule is a tobacco-smoke CADR of at least two-thirds of the room's floor area, so a 120-square-foot room needs at least an 80.
  • Avoid devices that produce ozone.
  • Keep airflow around the unit unobstructed.
  • Run it longer or at a higher speed for more filtration.

A bedroom is the most useful place for one, given how much time you spend there.

Pollen: keeping New Mexico's outdoors out

New Mexico State University says outdoor pollen enters homes through natural airflow and open doors and windows. Its guidance on juniper pollen adds that reducing the pollen in your immediate environment can help, that indoor air filters can be part of that, and that people with severe pollen allergies should consult medical professionals.

Practical habits:

  • Close windows during peak pollen, as AAFA and Mayo Clinic both advise, and rely on air conditioning.
  • Change clothes and rinse off after long stretches outdoors.
  • Keep the HVAC filter fresh through spring.
  • Avoid indoor smoking and wood-burning fireplaces if respiratory allergies are a concern, per Mayo Clinic.

If your cooling system is aging and you are sealing the house against pollen, make sure it can carry the load. Our piece on spring HVAC installation explains why planning before summer pays off.

Should you test your indoor air?

Usually not as a first step. The Connecticut Department of Public Health's guidance on testing says most indoor pollutants lack health-based residential standards, and mold has no established safe or unhealthy concentration. It recommends starting with a walkthrough: look for visible moisture or mold, odors, leaks, filter condition, ventilation, temperature and relative humidity. Targeted professional testing can help after a likely source is identified, but it should not stand alone.

A walkthrough checklist:

  1. Look under sinks, around the water heater and behind toilets for moisture.
  2. Check window frames for condensation and mold.
  3. Inspect the HVAC filter and the area around vents.
  4. Note any musty rooms and when the smell is strongest.
  5. Read a hygrometer in the bedroom and basement or lower level.

Our perspective

We have spent more than 38 years in New Mexico homes, and the allergy complaints we hear rarely come from a mystery. They come from a damp cabinet nobody noticed, a filter that was never changed, or a system that was never sized for the house.

That is why we start with the building, not the gadget. Plumbing and HVAC are the two systems that decide how much moisture and airflow your home has. When a licensed professional checks a leak, a drain, a cooling system or a boiler, we are also looking at the conditions that allergens depend on.

You will talk to a local expert when you call us, not an automated menu, and we leave your home clean. If allergies are making your home feel less like a refuge, start with a conversation about what you are seeing and smelling.

Aaron Waller, General Manager

How Waller's can help

We are a plumbing, heating and air conditioning company serving homeowners in Albuquerque, Rio Rancho, Corrales and elsewhere in New Mexico. For allergy-minded households, these are the services that matter most: leak detection and plumbing repairs to remove moisture sources, HVAC and AC maintenance and installation, and swamp cooler changeovers.

Waller's Plumbing and Heating, Inc

See everything we do on our plumbing, heating and cooling services page, or visit wallersplumbingandheating.com to book an appointment online.

FAQ

What MERV rating is best for allergies?

EPA recommends MERV 13 or the highest rating your system's fan and filter slot can accommodate. Higher-rated filters resist airflow more, so check your equipment first. If you are unsure, ask an HVAC professional.

Can my HVAC system make allergies worse?

A clogged filter can reduce airflow and strain the system, and poorly maintained ventilation systems are one way biological contaminants spread, according to EPA. Regular filter changes and seasonal maintenance keep the system working for you. A musty smell from the vents is a reason to call a technician.

What humidity level is best for allergies?

AAFA recommends keeping indoor humidity between 30% and 50%. Lawrence Berkeley National Laboratory reports that dust mites do not survive when relative humidity stays below about 50% for an extended period. A hygrometer will show you where your home sits.

Does an air purifier replace fixing the source?

No. EPA says portable HEPA cleaners have shown symptom improvements in some studies, but results are inconsistent, and source control remains important. Think of a purifier as a supplement to cleaning, moisture control and a good HVAC filter.

When should I see a doctor?

If symptoms are severe or do not improve once you have addressed your home, talk with your physician or an allergist. New Mexico State University advises people with severe pollen allergies to consult medical professionals.

Sources