Air Duct Cleaning Glossary

This no-BS glossary cuts through the HVAC jargon so Cambridge homeowners can spot real ductwork issues, compare quotes fairly, and know when Alvarez Air Duct Cleaning LLC should step in before Cambridge’s dusty seasons clog your system for good.

Think your Cambridge home’s air ducts are just metal tubes? Wrong. They’re the hidden highways for dust, pollen, and Cambridge’s notorious seasonal grime that quietly kill your HVAC’s efficiency. Learn what we clean and how we price it so you’re not overpaying for half-baked work. Serving Cambridge and the whole Route 2 corridor—Somerville, Arlington, Watertown, and beyond.

SEER rating

SEER (Seasonal Energy Efficiency Ratio) tells you how efficiently an air conditioner or heat pump cools your Cambridge home over an entire season. A higher SEER—say 16 vs. 13—means lower electric bills and a gentler footprint on Cambridge’s grid. Check your outdoor unit’s yellow EnergyGuide sticker or manual; if it’s below 14, it’s time to budget for an upgrade.

AFUE

AFUE (Annual Fuel Utilization Efficiency) measures how well your furnace turns gas or oil into heat. A 90 AFUE furnace wastes only 10% of its fuel as exhaust; anything under 80 AFUE is basically burning cash in your Cambridge winter. If your furnace is older than 15 years, its AFUE likely dropped below 70—call us to scope it before the next polar vortex hits.

Heat pump

A heat pump is a two-way HVAC Swiss Army knife: it pulls heat from the chilly Cambridge air in winter and dumps indoor heat outside in summer. Modern cold-climate models still work below 0°F, making them perfect for Cambridge’s freeze-thaw swings. Pair it with duct cleaning to keep airflow strong and your bills predictable year-round.

Air handler

The air handler is the indoor “lungs” of your HVAC system—it forces conditioned air through your ductwork and past the evaporator coil. If your Cambridge home’s air smells musty or the blower wheezes, the handler’s filter or coil may be caked with dust we can blast clean without tearing apart walls.

Condenser

The condenser is the outdoor metal box that dumps heat from your AC or heat pump into Cambridge’s summer air. If it’s caked with Cambridge pollen or shaded by ivy, your system’s efficiency plummets. A quick coil wash and coil cleaning can restore lost capacity and shave $100+ off your summer bill.

Evaporator coil

The evaporator coil lives inside your air handler and absorbs heat from indoor air, turning refrigerant into cool vapor. Over time, Cambridge’s humidity and dust glaze the coil like a griddle—sapping cooling power and breeding mold. We clean coils without chemicals so your system breathes easy again.

Refrigerant

Refrigerant is the lifeblood of your AC or heat pump, absorbing and releasing heat as it cycles between gas and liquid. Low refrigerant in Cambridge’s humid summers forces your system to overwork, short-cycling and driving up bills. If your coils ice up or cooling cuts out, a licensed pro should check for leaks—not just “top it off.”

BTU

BTU (British Thermal Unit) measures how much heat your furnace or AC can remove or add in one hour. A typical Cambridge single-family home needs 30,000–60,000 BTUs depending on insulation and square footage. Oversized units short-cycle and waste energy; undersized ones can’t keep up during a January cold snap—we size systems right.

Ductwork

Ductwork is the network of metal, flex, or fiberboard tubes that carry conditioned air from your HVAC to every room in your Cambridge home. Leaky or dirty ducts can lose 20–30% of your heating or cooling before it even reaches your vents—our duct cleaning restores airflow and cuts Cambridge humidity issues at the source.

Zoning

Zoning splits your Cambridge home into temperature-controlled areas using motorized dampers and separate thermostats. If your second-floor bedrooms bake while the first floor stays chilly, zoning can save energy without running the whole system 24/7. Pair it with duct sealing to lock in savings and comfort.

MERV rating

MERV (Minimum Efficiency Reporting Value) rates how well an air filter traps particles: MERV 8 stops dust mites, MERV 13 catches viruses. Cambridge’s pollen and construction dust demand at least MERV 11 in central systems; anything higher can choke airflow. Change filters every 60–90 days or your ducts will do the dirty work for you.

Load calculation (Manual J)

Manual J is the gold-standard formula HVAC pros use to size heating and cooling systems for Cambridge homes. It accounts for square footage, insulation, window orientation, and even whether you park cars in a garage. Skip it and you risk an oversized unit that cycles on/off constantly—wasting money and wearing out fast.

Thermostat setback

Thermostat setback is programming your thermostat to automatically lower (or raise) the temperature when you’re asleep or away—saving Cambridge homeowners 10–15% on annual bills. Smart thermostats like Ecobee or Nest make setbacks effortless; pair them with duct sealing to lock in every saved degree.

Short cycling

Short cycling is when your furnace or AC turns on and off too frequently—often less than 10 minutes per cycle. In Cambridge, this usually means a dirty filter, low refrigerant, or an oversized unit fighting itself. Left unchecked, it drives up bills and kills HVAC lifespan faster than Cambridge winters kill plants.

Static pressure

Static pressure is the resistance air faces as it moves through your ductwork and filters. High static pressure—common in Cambridge homes with crimped flex ducts or clogged filters—starves your system of airflow, forcing it to work harder and raising utility costs. We test and fix pressure issues so your system runs smooth, not strained.

Frequently Asked Questions