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Polar Express HVAC & Refrigeration

Air Conditioning

Cleaner, drier air starts with the duct system.

Polar Express tests and improves indoor air in homes across the San Antonio metro, with 24/7 emergency dispatch and same-day service on most repair calls. One flat-rate price is approved in writing before work begins for duct leakage, filtration, airflow, static pressure, and humidity work. TDLR license TACLA00127982C.

Most air quality complaints in this city trace back to two things: humidity the system never removes, and ducts quietly pulling attic air into the house.

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  • Licensed TACLA00127982C
  • Since 2023
  • 4.9 Google rating

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Tell us what's going on. We'll call you back, usually within 15 minutes during business hours.

No obligation. No high-pressure sales. We'll text you a confirmation.

Indoor air quality is an area where a great deal of equipment gets sold before anything gets measured, so it is worth being clear about what we will and will not claim. Cleaner, drier, better-filtered air is something a system can genuinely deliver. Medical outcomes are not something any HVAC contractor should be promising anybody. What we can tell you is that in a humid subtropical climate the two problems behind most complaints are the same two nearly every time: air that stays wet enough indoors to feel heavy and to encourage growth, and a duct system in an unconditioned attic drawing dust and hot air into the house through its own leaks. Polar Express addresses both, along with filtration and ventilation, and the work starts by looking at what is actually happening rather than by quoting a product.

What we handle

Indoor Air Quality covers more than one failure.

The complaint that gets called in is rarely the whole job. These are the things a technician is actually looking at on this equipment.

  • Filtration, sized to the system

    Media filters and higher-MERV options chosen against what the blower can actually pull through them, because a filter too restrictive for the equipment trades one problem for a worse one.

  • Duct sealing and repair

    Sealing the leaks, disconnected boots, and crushed flex that let a hot attic into the airstream. In most Texas homes this is the highest-value item on the whole list.

  • Humidity control

    Whole-home dehumidification, correct equipment sizing, and fan settings, so the house sits in a comfortable range instead of cold and clammy at the same time.

  • Air purification and coil UV

    Cabinet-mounted purification and coil ultraviolet, explained honestly: what each one is aimed at, what it can help reduce, and where the evidence for it stops.

  • Ventilation and pressure balance

    Return air that matches the supply, rooms that are not pressurized against the rest of the house, and combustion safety wherever gas appliances share the space.

  • Measure before and measure after

    Humidity, static pressure, and airflow read before anything is recommended and again once it is installed, so you can see for yourself whether it worked.

Signs and causes

What you are seeing, and what usually causes it.

Read these before you call. Knowing which one matches gets the right parts on the truck, and a couple of them are worth acting on in the next ten minutes.

  • The house feels muggy even when it is cool

    Cold and damp usually means the system satisfies the thermostat before it has run long enough to dehumidify, which is a sizing, staging, or fan-setting problem. Adding capacity makes it worse. Longer, gentler run times are what actually pull water out of a house.

  • Dust is back a day after cleaning

    Persistent dust in a Texas home is often the duct system rather than the housekeeping. Leaks on the return side pull insulation fibers and attic dust straight into the airstream and then distribute them evenly to every room in the house.

  • Certain rooms are stuffy or smell different

    A room that smells unlike the rest of the house usually has a pressure problem: not enough return path, a door that closes off the only return, or a supply boot that came loose above the ceiling and is now conditioning the attic.

  • Condensation on windows or registers in summer

    Water forming on a supply register or a window in July means humid air is meeting a cold surface. It is worth acting on, because sustained moisture against building materials is how you get growth that becomes an air quality complaint of its own.

  • One person notices it and nobody else does

    When a single member of the household reacts to the indoor air, better filtration and controlled humidity can help reduce what is circulating, and that is the extent of what we will claim. Anything touching a medical condition belongs to a physician rather than to an HVAC company.

What it costs

You approve the price before the work starts.

Indoor air quality is the easiest line on an HVAC invoice to spend money on the wrong thing, so we quote it in order of what returns the most. Duct sealing and correcting airflow come before adding equipment almost every time, filtration gets chosen against what your blower can handle, and dehumidification is sized to the house instead of to a catalog page. Each recommendation is priced on its own with the reasoning attached, so you can take the first item and leave the rest, and we would honestly rather you did that than buy a package. All of it is quoted flat rate, and you approve each piece before it begins.

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What moves the number

  • The size of the duct system and how much of it is reachable for sealing
  • Filter type and cabinet, since a higher-MERV media filter usually needs a larger housing
  • Whether whole-home dehumidification is warranted, and where it can physically go
  • Any purification or ultraviolet equipment added at the air handler
  • Whether return air has to be added or resized to correct a pressure problem
  • How much testing is involved before and after the work is done

How the job runs

What happens between your call and a working system.

  1. Step 1

    Start with questions, not a product

    Which rooms, what time of day, what changed and when. A complaint that only appears in the afternoon and a complaint that has been constant for two years point at completely different causes.

  2. Step 2

    Look at the ducts and take readings

    Static pressure, airflow, indoor humidity, and a physical look at the duct runs in the attic. This is the step that gets skipped when somebody shows up ready to sell a box.

  3. Step 3

    Recommend in priority order

    The list comes back ranked by what changes the most for the least, with an honest note beside anything whose benefit is harder to demonstrate. You are free to stop anywhere down that list.

  4. Step 4

    Verify the change

    The same readings get taken afterward and you keep both sets. If the numbers did not move, that is a conversation we would rather have with you than quietly avoid.

Questions

Straight answers, before you call.

Still not covered here? The person who answers the phone can usually settle it in a sentence, day or night.

Call (210) 376-0781

For most residential systems, a filter somewhere in the MERV 8 to MERV 11 range captures a meaningful share of dust and pollen without choking the blower. Going higher is possible, but only where the filter cabinet and the duct system were built for the added resistance, because a restrictive filter in an undersized return raises static pressure, cuts airflow, and can freeze the coil. Have the static pressure measured before jumping to a high-MERV filter.

An air conditioner removes moisture only while it is actually running, so anything that shortens run time leaves water in the air. Oversized equipment, a fan left on continuous circulation, duct leakage in a humid attic, and thermostat settings that produce short bursts all end in a cold, clammy house. In San Antonio the fix is normally longer, gentler cycles or dedicated dehumidification, not a bigger unit.

In a house whose ducts run through an unconditioned attic, it is usually the best value on the entire indoor air quality list. Leaks on the supply side dump air you paid to cool into the attic, and leaks on the return side pull attic air, dust, and insulation fibers into the house. Sealing them improves comfort, air cleanliness, and run time simultaneously, which very little else on this page does.

Some do something specific, and none of them substitute for filtration, humidity control, and clean ducts. Coil ultraviolet is aimed at keeping biological growth off a wet evaporator coil, which is a real and narrow job it does reasonably well. Cabinet purification products vary widely in what they have been tested against. We will tell you which category a given product falls into and let you decide, rather than selling it as a cure for anything.

Better filtration and controlled humidity can help reduce the dust, pollen, and mold spores circulating inside a house, and that is as far as an HVAC company should ever go. Nobody here is going to tell you it treats a medical condition, because that is a claim for a doctor to make about a specific person. What we can do is measure what is in the air path, improve it, and show you the readings on both sides of the work.

Polar Express provides one written flat-rate price for indoor air quality work in San Antonio, approved before work begins. The total depends on the amount of duct sealing, the filter cabinet and media selected, and whether humidity control or airflow corrections are needed. Each recommendation is priced separately so the homeowner can approve only the work that matters.

Polar Express works with all major indoor air quality equipment brands in San Antonio, including media filters, dehumidifiers, purification cabinets, coil ultraviolet equipment, and controls. Brand is considered alongside blower capacity, static pressure, duct condition, and available service parts, because the equipment must fit the existing air system rather than restrict it.

Related services

The work that usually comes with this one.

Nearby

We run this service across the San Antonio metro. These are three of the areas we cover, and the full list lives on the service areas page.

One call, day or night.

Licensed, locally owned, and answering the phone around the clock. You get the diagnosis in plain language and the price before the work starts.

Call 24/7 · (210) 376-0781Book Service