Furnace

TL;DR: Why Your Furnace Is Blowing Cold Air
A furnace blowing cold air does not always mean the furnace is broken. Sometimes the thermostat or fan settings are the issue.
Dirty air filters are one of the most common causes because they restrict airflow and can trigger safety shutoffs.
Ignition problems, flame sensor issues, and furnace lockouts can prevent the burners from heating the air.
Some causes are simple homeowner fixes, while others require professional diagnosis and repair.
The best HVAC company will help you determine whether a furnace repair or furnace replacement actually makes sense instead of automatically recommending the most expensive option.

TL;DR: What Size Furnace Do I Need?
Furnace size is measured in BTUs, but square footage alone is not enough to determine the right size.
An oversized furnace can cause short cycling, uneven heating, higher energy bills, and extra wear and tear.
An undersized furnace may run constantly and struggle during Colorado cold snaps.
Proper furnace sizing should consider insulation, windows, ceiling height, airflow, ductwork, and climate through a Manual J load calculation.
The best furnace is not the biggest one. It is the system that fits your home, comfort needs, and long-term energy goals.

Repair usually makes sense for newer furnaces with smaller, isolated issues
Replacement is often smarter for systems over 15 years old with expensive repairs
Frequent breakdowns, rising energy bills, and uneven heating are major warning signs
A cracked heat exchanger or safety concern is often a strong reason to replace
The best decision comes from understanding long-term value, not just today’s repair cost

Repair usually makes sense for newer furnaces with smaller, isolated issues
Replacement is often smarter for systems over 15 years old with expensive repairs
Frequent breakdowns, rising energy bills, and uneven heating are major warning signs
A cracked heat exchanger or safety concern is often a strong reason to replace
The best decision comes from understanding long-term value, not just today’s repair cost

In Colorado, gas furnaces are usually cheaper to run and perform better in cold weather
Electric furnaces cost less up front, but often lead to higher monthly energy bills
Gas heats faster and stronger, which matters during freezing temperatures
Electric works best in smaller homes or where gas is not available
The right choice depends on your home, budget, and long-term plans, not just price

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