Air Duct Cleaning Glossary

This glossary explains the most important air-duct and HVAC terms in plain English so Weymouth homeowners can make confident, informed decisions about keeping indoor air clean and systems running efficiently.

Whether you’re a first-time homeowner in Weymouth or simply want to understand how your heating and cooling system works, knowing these terms helps you spot small problems before they become big repair bills. Air Duct Cleaning services Weymouth service areas Request a free estimate

SEER rating

SEER stands for Seasonal Energy Efficiency Ratio. It measures how efficiently a central air-conditioner cools your Weymouth home over an entire season. A higher SEER (16 or above) means lower electric bills and a gentler impact on the grid—especially helpful during humid summer days on the South Shore.

AFUE

AFUE, or Annual Fuel Utilization Efficiency, tells you how much of the fuel burned by your furnace actually heats your home instead of going up the chimney. An AFUE of 90 % means 90 cents of every dollar you spend on gas or oil stays inside your Weymouth house.

Heat pump

A heat pump is an all-in-one heating and cooling unit that moves heat rather than creating it. In summer it pulls heat out of your home; in winter it reverses and pulls heat from the outdoor air—even when it’s 20 °F on Sea Street. Learn how we service heat pumps

Air handler

The air handler is the indoor part of your HVAC system that pushes conditioned air through the ductwork. It houses the blower fan, evaporator coil, and air filter, so keeping it clean is key to healthy air in your Weymouth home.

Condenser

The condenser is the outdoor unit of an air-conditioning or heat-pump system. It releases heat absorbed from inside your Weymouth house into the outside air. Keeping the condenser coil free of salt spray and leaves helps it run efficiently year after year.

Evaporator coil

The evaporator coil sits inside the air handler and absorbs heat from the air blowing past it, turning refrigerant from a hot gas to a cool liquid. Over time, mold and dust can build up on the coil, reducing cooling power and lowering indoor air quality in Weymouth homes.

Refrigerant

Refrigerant is the special chemical that absorbs and releases heat as it cycles between the indoor and outdoor units. Older systems may still use R-22 (Freon), which is being phased out; newer systems use R-410A or R-32, which are more environmentally friendly.

BTU

BTU stands for British Thermal Unit, the amount of heat needed to raise one pound of water by one degree Fahrenheit. HVAC systems are sized in thousands of BTUs per hour; choosing the right BTU capacity for your Weymouth home keeps rooms comfortable without short cycling.

Ductwork

Ductwork is the network of metal, fiberglass, or flexible tubes that carries heated or cooled air from your furnace or air handler to every room in your Weymouth house. Leaky or dirty ducts waste energy and circulate dust, pollen, and mold spores throughout your home.

Zoning

Zoning divides your Weymouth home into separate temperature-controlled areas using motorized dampers in the ductwork. Zoning lets you heat or cool only the rooms you’re using, saving energy and improving comfort without running the whole system.

MERV rating

MERV stands for Minimum Efficiency Reporting Value and rates how well an air filter traps particles. A MERV 8 filter catches dust and pollen, while a MERV 13 filter also captures mold spores and pet dander—important for Weymouth homes near the ocean where salt and humidity can aggravate allergies.

Load calculation (Manual J)

Manual J is the industry-standard method for calculating how much heating and cooling your Weymouth home actually needs. It considers square footage, insulation, window orientation, and even the shade from nearby trees to size your HVAC system correctly the first time.

Thermostat setback

Thermostat setback is the practice of automatically lowering the temperature when you’re asleep or away and raising it before you wake up or return. Programmable or smart thermostats make this easy and can cut heating and cooling costs by 10 % or more in a typical Weymouth home.

Short cycling

Short cycling happens when your HVAC system turns on and off too frequently, never reaching full capacity. In Weymouth homes this wastes energy, strains equipment, and leaves humidity and dust circulating. Common causes include an oversized unit, a clogged air filter, or leaky ductwork.

Pleated filter

A pleated filter is an air filter with accordion-style folds that increase surface area and trapping power. Pleated filters with a MERV 11–13 rating are a smart upgrade for Weymouth homes near the coast, where salt air and pollen demand finer filtration.

Static pressure

Static pressure is the resistance air encounters as it moves through your ductwork and filters. High static pressure forces your blower to work harder, wastes energy, and can shorten the life of your HVAC system—especially in older Weymouth homes with narrow duct runs.

UV germicidal lamp

A UV germicidal lamp is an in-duct ultraviolet light that kills mold, bacteria, and viruses as air passes by. Installing one in your Weymouth home’s air handler adds an extra layer of protection against airborne pathogens, especially helpful for family members with allergies or asthma.

Frequently Asked Questions