Modern furnaces are a lot more complicated than just burning gas and air. To work properly, your furnace regulates the air-fuel mixture. Natural gas and propane used to be cheap forms of heating, but as they become more popular those days are ending. As the prices for fuel increases, the efficiency of the burn becomes more important. Natural gas is a light fuel that should burn blue. A yellow flame in a natural gas furnace probably means that it is not getting enough air. A Denver furnace repairman should be able to adjust the airflow to fix a yellow flame rather easily.
Other common problems with furnace flames are flames that flicker or roll out. An adjustment to your furnace will be necessary in most cases. The HVAC tech may have to test the actual composition of the flame with an expensive instrument called a a combustion analyzer. The analysis tells your Denver HVAC technician the temperature as well as the levels of carbon dioxide, monoxide, and oxygen given off by the flame.
Having the furnace fumes completely exhausted outside the home is very important. Carbon monoxide can lead to headaches, nausea and even death. A dirty burning furnace can have other toxic byproducts as well. Your Denver furnace repair company should do a furnace draft test to make sure your furnace is not leaking exhaust into your home.
I recommend all homes have a carbon monoxide detector installed to protect the occupants from this invisible, smell-less gas. Carbon monoxide poisoning is no joke and long term exposure can cause brain damage. Carbon monoxide basically replaces oxygen in your blood and starves your brain of oxygen. During my work in my Denver HVAC company, we usually find 4-5 homes a year that have a carbon monoxide leak, so there must be many more that are completely unaware.
If the problem with your furnace flame is the gas level and not the air mixture, your HVAC guy should do a gas pressure test. Depending on the type of fuel (natural gas, propane, or heating oil) the required pressures are different. The optimal level will lead to complete combustion of the fuel.
When it comes to heating the house, many people immediately think that it's a good choice to go for a furnace that is as big as possible, the reasoning being that it is better to have too much power than not enough.
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