FAQ about Air Conditioners & Furnaces
Need to talk to Friendly HVAC Pro in Denver Metro CALL 303-680-8800

Q. My furnace is less 10 years and a contractor tells me I need a new furnace is this true? Or AC is less than 5 yrs        old same question ?                       

A. Most furnaces come with a 20 year warranty on Heat Exchanger and 5 to 10 year on parts. Most Central Air units come with a 5 to 10 year Compressor and parts warranty. 99% of the time it can be repaired. Please, Please get a 2nd or 3rd opinion before you spend $1000's of dollars you can keep in your pocket when all you may need is JUST A REPAIR.

Q. Do I need service if my air conditioner seems to be operating fine?

A. Yes. Simply because there is cool air blowing from your house air ducts does not mean you're getting all the cooling air conditioned comfort you're paying for.

Q. What kinds of things can cause my air conditioner to operate inefficiently?

A. A dirty air filter, Improper refrigerant charge and air flow are the biggest culprits. Too much or too little refrigerant can cause your air conditioner to overwork. The same is true if the air flow across the inside coil is low, the coil may need to be cleaned.

Q. Why is there ice on pipes going to the compressor unit outside & ice on the pipes going to AC coil attached to furnace or air handler inside.

A. You may have a dirty air filter, dirty Evap coil attached to furnace or you are low on Freon. Turn the cooling off at the thermostat and turn the fan mode at thermostat to on and let it run for several hrs or till the ice is melted, replace filter if needed. Turn thermostat back to cool and monitor situation.

Q. How often do you change air filter in air conditioner ?

A.The air conditioner unit outside (condenser) does not have a filter in it. The only filter you change is the same filter
that is inside in the furnace or air handler. It’s the same filter that you change in winter.

Q. How long is a furnace air filter good for ?

A.  The disposable cheaper filter (EZ flow brand $1 each or better Flanders Filter on Amazon ) 1-2 months. 3M filter ($20 each) 2-3 months.  In Colorado we recommend Flanders Filters they let the most air pass while still filtering . The altitude with the lack of Air requires a cheap flat filter , not pleated like an Accordion . 

Q. Air conditioning filter not getting dirty ?

A. Air is being sucked back by gaps in ductwork, look for tears in flex duct and gaps in sheetmetal duct back to furnace or air handler. Use aluminum tape or duct sealer  (Home Depot or Lowe’s etc)

Q. Is the air conditioning blower on but you are getting little airflow ?

A.  This is caused by a packed and dirty air filter, weak blower motor or dirty evaporater coil on furnace or air handler. Replace filter .  First then check under belly of evaporater coil clean. If problem not solved its most likely the blower motor.

Q. Can you run AC without filter ?

A.Not a good idea, will cause evaporator coil on furnace/air handler to plug up restricting air flow and cause icing on AC system



One or more of the following symptoms which may require your AC to be serviced

  • Your Air Conditioner Runs Too Long
  • Your Air Conditioner Runs All the Time
  • Your Utility Bills Seem High
  • The Indoor Humidity is Just As High or Higher than the Outdoor Humidity
  • Some Rooms are Hot while Other Rooms are Cool
  • Your House Never Seems to be Comfortably Cool Enough
  • You've had Refrigerant Added More than Once in the Past 5 Years
  • There is Too Little Air Flow from the Floor or Ceiling Registers
  • Extremely Cold Air is Blowing from the Registers
  • The Air Conditioner Keeps Shutting Off When the House is Hot.
  • The Air Conditioner Has Not Been Serviced For More Than Two Years.




Serving the following Cities


Aurora , Arvada , Broomfield , Castle Rock , Castle Pines , Centennial , Cherry Hills , Commerce City , Denver, Elizabeth , Franktown , Highlands Ranch , Glendale, Greenwood Village , Littleton, Lakewood , Lafayette ,Larkspur , Louisville , Northglenn , Parker , Reunion , Superior , Thornton , Westminster , 


Furnace Questions ?

Why is the furnace blower motor running but no heat is coming out?

1. The igniter (no more pilot takes the place of the pilot on newer furnaces) is bad and needs to replaced.

2. You have a dirty filter and the high temperature limit tripped the furnace to run the fan constantly without heat to cool the furnace. If the fan doses not shut down and allow the heat to start the limit may need to be reset.

3. The thermostat in the home maybe in the fan/on mode.

How do I change my furnace air filter and were is it located?


The furnace filter can be located in several places. Most common would be to the right or left of furnace there is the sheet-metal return air drop which attaches to side of furnace this may have what looks like a sliding metal door that you can slide it up and filter goes inside. The arrow on filter points to the furnace. If there a bracket to hold filter in place -Good. If no bracket lean filter at a angle so the top is against furnace and bottom is away diagonal from top.

Other Places Filters are Found

1. If furnace is in basement remove bottom panel on furnace and see if its in there.

2. There may be a box *(return air box) that the furnace sits on look for and access panel into box.

3.  If furnace is in crawl space and laying down the filter will be typically on the right side of furnace flue connection in  the return.  Or behind the panel that houses the blower motor which is also to right of flue connection.

4. If the Furnace is the attic the filter or filters can be in the ceiling return air vents or in the attic itself similar to a crawl space furnace.

5. Electronic air cleaner (EAC)  - be sure the power is OFF before you begin. EAC filters are washable with 2-3 sections and 4-6 components. First pull off the front cover and remove the big 4 inch wide cells (2 of them) be sure to pull them and reinstall them in the same way & direction you took them out. The pre-filter is a skinny 1/4 inch wire mesh that is first to filter the air there are 2 pieces to this side by side. Slide these out  & wash the pre-filters. If the 4 inch wide cells are dirty gentle vacuum the with soft brush. Some EAC's have a hepa filter also vacuum these and re -install all of the above.

How often do I change my furnace filter?

A dirty air filter can cause big problems on a furnace heating exchanger and furnace blower motor. A heat exchanger is like your car engine if you don’t have enough air (antifreeze) removing heat off the surface it runs too hot in the winter. If you have air conditioning a dirty filter can cause the “A” coil that circulates freon located on top of the furnace to freeze in the summer. A dirty air filter can also cause the furnace blower motor to pull more electricity and over heat as well. My advice would be to change the furnace filter at least once every 4 to 6 weeks during heating season and for air conditioning once a month.

What kind of filter do you recommend?

In the winter you can use any kind for heat EZ flow, high efficiency or pleated (accordion type) In the summer for air conditioning I only recommend EZ flow or flat filters. The “A” coil is very easy to frost and needs as much air as the blower motor can push, a high efficiency or pleated filter will obstruct the air flow and cause frosting and eventually freeze in a matter of days to were you have solid block of ice sitting on your furnace.

What Do I do if the coil freezes up?

If in the summertime you notice water on the floor around the furnace and when the air conditioning is on there is no air coming out of the vents you most likely have a frozen coil(coil is attached to furnace or air handler). If you filter is the wrong kind or dirty replace it. Then go to the thermostat and switch cool to off and auto to fan. What this does is run your fan continually without the air conditioning and allows the coil to thaw out (it usually takes 4-6 hrs to thaw).

If that didn't work then you may be low on Freon or your coil is dirty and needs to be cleaned.

Is it a good Idea to run the fan on thermostat all the time to circulate air?

I recommend for homes in summertime to run the fan all the time to circulate the air conditioned air this will keep a more constant temp throughout the house. With homes with vents on the floor it helps to keep the air from stratification (a blanket of hot air on the ceiling and cold air on the floor). Ceiling fans are important too in summer turn them clockwise in winter counter clockwise. You air conditioning will come on and off by the thermostat but the fan will run constant.

Why did my furnace blower motor go out in just a couple years from purchase?

If you have both a heating and air conditioning system and the thermostat is set on auto your blower motor turns on and off every time it calls for heat or cool.
The amount of strain on the motor windings is much higher than if the fan is allowed to just run continually. Ex: If a light bulb is turned on and off continually it will burnout faster than if it was just left on.

 Signature Heating and Air Conditioning

Establisted in 1999 Family owned & operated 

No Bull, No Gimmicks,  No Nonsense , No Bait & Switch , No upsell, No nothing

Why are we still in business after 19 yrs because we tell it like it is.

Serving Denver and Aurora Metro Areas

We accept all major credit cards


***Note*** Warranty parts replacement and labor  is performed Monday thru Friday 8 AM to 5 PM only. After hours and weekends will be charged a $109 Trip Fee. 

***Note*** Warranty only covers defective Parts REPLACEMENT in  Furnace or Air Conditions not Maintenance. Maintenance Example: dirty air filter in furnace, dirty flame sensor in furnace, dirty AC condenser or Evaporater coil,  dirty laundry LOL. Batteries in thermostat, plugged condensate line on AC evaporater coil. 

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We service the below City & zip codes:       Three office locations to better serve you

Arvada: 80002 80003 80004 80005 80007 North office Richard 720-288-6513

Aurora: 80010 80011 80012 80013 80014 80015 80016 80017 80018 80019 80020  Main office 

Broomfield: 80020 80021                   North office Richard 720-288-6513

Castle Rock: 80104 80108 80109                      Main office  303-680-8800

Castle Pines North: 80108 80109                     Main office  303-680-8800

Castle Pines Village: 80108 80109                     Main office  303-680-8800

 Centennial:  80111 80121 80122 80015 80016  Main office  303-680-8800

Colorado Springs: 80901 80904 80907 80902 80905 80908 80903 80906 Springs office 719-287-3577

Commerce City:   80022                                   Main office   303-680-8800

Denver:  80204 80219 80210 80209 80216 80220 80231 80239          North office Richard 720-288-6513

Denver Green Valley:                                             Main office   303-680-8800

Denver Tech Center:                                              Main Office 303-680-8800

Englewood:  80110 80111 80112 80113             Main office   303-680-8800

Erie: 80516                                          North office Richard 720-288-6513

Elizabeth/Franktown: 80116  not at this time , we refer Sam w/ Mountain Ash Heating & Air 720-302-3445

 Golden: 80401                                     North office Richard 720-288-6513


Highlands Ranch: 80126 80129 80130                Main office  303-680-8800 

Lonetree 80124                                                 Main office  303-680-8800

Lafayette: 80026                                 North office Richard 720-288-6513


Lakewood: 80226                                North office Richard 720-288-6513

Louisville: 80027                                 North office Richard 720-288-6513

Littleton: 80120 80121 80122 80123 80124 80128 80125 80127 Main office 303-680-8800

Morrison: 80465                                                                     Main office 303-680-8800

Momument: 80132 80133 80921                                                             Springs office 719-287-3577

Parker: 80134 80138                                                               Main office 303-680-8800

Reunion/Commerce City  80022 80037 North office Richard 720-288-6513

Thornton: 80260 80228 80022 80640      North office Richard 720-288-6513

Northglenn:  80233                               North office Richard 720-288-6513

Superior: 80030                                     North office Richard 720-288-6513

Westminster: 80031 80035 80036           North office Richard 720-288-6513

Wheatridge: 80233                                North office Richard 720-288-6513

Zip codes within 5-20 minutes of our office 80104 80109 80019, 80018, 80016, 80015, 80014, 80013, 80012, 80011, 80010, 80134,  80138, 80110, 80111, 80112, 80113, 80122, 80124, 80126, 80128, 80127, 80129, 80130, 80104, 80108, 80109, 80231, 80237, 80239, 80249, 80222, 80224 . We also service Adams County, Arapahoe County, Denver County, Douglas County, Elbert County, Jefferson County



7201 S Rome St
Centennial, Colorado 80016
Tel: (303) 680-8800
Cell / Text : (303) 946-9486
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