Heating and Air Conditioning FAQ for Denver-Area Homeowners

Go Green Heating and Air Conditioning is a NATE-certified HVAC company based in Arvada, Colorado, serving homeowners across the Denver metro area. Below are clear answers to the questions we hear most about furnaces, air conditioners, heat pumps, water heaters, and indoor air quality. Don't see your question? Call us at 303-919-9292.

Last updated: October 2026

About Go Green

  • Go Green Heating and Air Conditioning is based in Arvada, Colorado, and serves homeowners across the Denver metro area, including Arvada, Wheat Ridge, Golden, Lakewood, Westminster, Broomfield, Denver, Littleton, Northglenn, Thornton, Evergreen, and Genesee.

  • Go Green repairs and installs furnaces and air conditioners, and also installs hybrid (dual-fuel) heat pump systems, ductless mini-splits, and tankless water heaters. We also offer indoor air quality solutions, Manual J load calculations, maintenance plans, and 24/7 emergency HVAC repair.

  • Yes. Go Green is NATE certified (North American Technician Excellence), the leading certification for HVAC technicians. Go Green is also BBB accredited with an A+ rating.

  • Yes. Go Green Heating and Air Conditioning offers free quotes. Call 303-919-9292 or use the contact form on our website to request one.

  • Yes. Go Green Heating and Air Conditioning offers special financing on purchases over $1,500, subject to credit approval.

  • Yes. Go Green Heating and Air Conditioning backs its work with a 100% satisfaction or your money back guarantee.

  • Call 303-919-9292, email info@GoGreenHeatingandAC.com or fill out the contact form on our website.

Heating and Cooling in Colorado

  • Yes. At Denver-area elevations, the air holds less oxygen, so gas furnaces need to be set up for high altitude according to the manufacturer's instructions. A furnace that isn't adjusted for altitude can run inefficiently, wear out faster, and in some cases produce excess carbon monoxide. Ask your installer to confirm your furnace is set up for your elevation.

  • Yes. Modern cold-climate heat pumps heat efficiently well below freezing. For the coldest Front Range nights, a hybrid (dual-fuel) system pairs the heat pump with a gas furnace that takes over automatically, which is why hybrid systems are a popular choice for Denver-area homes. When the system is 15 years or older, has frequent breakdowns, has jumped significantly in energy costs, or when the repair estimate is 50% or more of the replacement cost.

  • Xcel Energy and the State of Colorado have offered rebates and tax credits for qualifying heat pumps and high-efficiency equipment. Program amounts and rules change often, so ask Go Green to check what is currently available for your home before you buy.

  • Schedule a furnace tune-up in October. Denver's first hard freeze often arrives in October, and a tune-up before then catches problems before you need heat every night.

General HVAC

  • HVAC stands for heating, ventilation, and air conditioning. It covers every system that controls indoor temperature, humidity, and airflow, including furnaces, air conditioners, heat pumps, ductwork, vents, and filters.

  • Have your HVAC system serviced twice a year: once in the spring before cooling season and once in the fall before heating season. Go Green's maintenance plan makes it easy to stay on that schedule.

  • Common signs include rising energy bills without a change in usage, uneven temperatures or hot and cold spots, strange noises such as banging, clanking, or humming, frequent cycling, poor airflow, unexplained increases in indoor humidity, and a system that is 15 years old or more.

  • Change your air filter every 1 to 3 months in most homes. If you have pets, allergies, or smokers in the home, change it more often.

  • A useful rule of thumb: if a repair will cost 50% or more of what a replacement would cost, and the system is older or inefficient, replacement usually makes more financial sense in the long run.

  • Yes. Go Green Heating and Air Conditioning offers 24/7 emergency HVAC repair across the Denver metro area. Call us anytime at 303-919-9292.

Heating and Furnace

  • A furnace typically lasts 15 to 20 years with proper maintenance. Yearly tune-ups help it reach the long end of that range.

  • Consider replacing your furnace when it is 15 years or older, breaks down often, has caused a big jump in energy costs, or when the repair estimate is 50% or more of the cost of a new furnace.

  • Rattling usually means loose parts. Buzzing suggests an electrical problem. Whistling can point to dirty ducts or a clogged filter. Banging at startup often means delayed ignition, which should be checked by a technician right away.

  • Replace the air filter, test your thermostat in heat mode, vacuum the vents, clear clutter away from the furnace, make sure your smoke and carbon monoxide detectors work, and schedule a fall tune-up.

Air Conditioning

  • An AC usually blows warm air because of a clogged filter, incorrect thermostat settings, a refrigerant leak, a frozen evaporator coil, or a failing compressor. Check the filter and thermostat first, then call a technician if the problem continues.

  • Consider replacing your AC if it is 10 years or older, needs frequent repairs, cools unevenly, has weak airflow, cycles on and off more than it should, or your energy bills have gone up without explanation.

  • Yes. A spring AC tune-up makes sure your system is ready before the heat arrives and catches small problems before they turn into mid-summer breakdowns.

  • Uneven room temperatures are usually caused by closed or blocked vents, leaky or undersized ductwork, poor insulation, sun-facing windows, a dirty filter, or a system that was sized without a proper load calculation. In multi-level homes, heat rises, so upper floors often run warmer. Zoning or a ductless mini-split can fix rooms that never feel right.

Hybrid Systems

  • A hybrid system, also called a dual-fuel system, pairs an electric heat pump with a gas furnace. The heat pump handles heating and cooling most of the year, and the furnace takes over automatically when temperatures drop too low for the heat pump to run efficiently.

  • A hybrid system costs more upfront than a conventional system, but it lowers monthly energy bills because the system always runs on the most efficient fuel for the outdoor temperature.

Tankless Water Heaters

  • A tankless water heater heats water on demand instead of keeping a large tank of water hot around the clock. That saves energy and means you don't run out of hot water.

  • Yes. With proper maintenance, a tankless water heater typically lasts 20 years or more, compared with roughly 10 to 15 years for a conventional tank.

Ductless Mini-Splits

  • A ductless mini-split is a heating and cooling system that works without ductwork. It has an outdoor compressor connected to one or more indoor air handlers, which makes it a good fit for additions, finished basements, garages, and rooms that never get comfortable.

  • Yes. Most mini-splits run on a heat pump, so they provide warm air in winter and cool air in summer.

Indoor Air Quality

  • Common signs include allergy symptoms that get worse indoors, heavy dust buildup, unexplained odors, humidity swings, and a stale smell in rooms with limited airflow.

  • Yes, especially HEPA-level models. Air purifiers work best alongside proper ventilation, not as a replacement for it.

Load Calculations

  • A Manual J load calculation is the industry-standard method for finding out how much heating and cooling capacity your home actually needs, measured in BTUs. It accounts for your home's size, insulation, windows, and layout.

  • An oversized system short-cycles, which wastes energy and wears out parts early. An undersized system runs constantly and still can't keep up. A Manual J load calculation gets the size right.

Emergency Repairs

  • An HVAC emergency is any situation with an immediate impact on your health, safety, or property, including total loss of heat in winter, loss of cooling in extreme heat, a suspected gas leak, electrical problems, or flooding from a condensate line.

  • After-hours emergency service typically costs more because of overtime and priority scheduling.

  • Turn the system off, close blinds to block heat or hold in warmth, check the thermostat batteries and the circuit breaker, use a fan or space heater if it is safe to do so, and avoid DIY repairs on gas or electrical parts. Then call Go Green at 303-919-9292.