What Is a Home Energy Audit? A Colorado Homeowner's Guide

There is a room in a lot of Colorado homes that never quite behaves. The upstairs bedroom that runs ten degrees warmer in July. The office above the garage nobody wants to use in January. A draft in the hallway you can feel but cannot find. Or no obvious symptom at all, just a bill that keeps climbing.

The difficulty is that each of these has several possible causes. A cold upstairs bedroom might be insulation. It might be an air leak below it pulling conditioned air out of the house. It might be ventilation or ductwork. Adding insulation to a home that is mostly leaking air will not fix much, and sealing a home that never had enough insulation will not either.

A professional home energy audit is how you find out which one you are dealing with before you spend anything.

What Is a Home Energy Audit?

Think of it as a checkup for your house. Rather than looking at one cold room or one high bill, an audit evaluates the whole home: the building envelope, insulation, air leakage, ventilation, and mechanical systems, and how they interact.

An energy audit is a technical diagnostic, not an estimate. The fieldwork is performed by a BPI-certified energy auditor, and the results are then analyzed and modeled by our in-house Professional Engineer.

BPI is the Building Performance Institute. It certifies the professionals who perform audits, and it develops the scientific standards that utility programs, including Xcel Energy's, build their requirements on. That is worth knowing, because it means a BPI audit is not a credentialed opinion. It is the standard the rebate programs themselves are measured against.

How the Audit Differs From Our Other Home Evaluations

Homeowners sometimes hear "scan," "evaluation," and "audit" used interchangeably. They are three separate things:

• Courtesy home scan. A quick review included with every paid visit, at no charge, covering the systems we are already on site for.

• Member home evaluation. An annual, broader assessment of the home, available through our Home Advantage membership.

• Energy audit. A standalone technical diagnostic focused specifically on energy efficiency and reducing utility bills, using diagnostic testing equipment.

  
  

Only the energy audit involves blower door testing, thermal imaging, and an engineered report. It is also the only one tied to utility rebate programs.

What Happens During a Home Energy Audit?

Blower door testing

A calibrated fan mounts in an exterior doorway and slightly depressurizes the house, pulling outside air in through every gap in the envelope.

What you learn: a measured airtightness number for your home, and the location of specific leaks that are invisible on a normal day. Common culprits in Front Range homes are attic top plates, ceiling penetrations, attic hatches, and basement rim joists.

Infrared thermal imaging

A thermal camera reads surface temperature rather than visible light.

What you learn: where insulation has settled, compressed, or was never installed, without opening walls. Paired with blower door results, thermal imaging distinguishes an insulation gap from an air leak. Different problems, different fixes.

Insulation and ventilation assessment

Attics get direct attention, since that is often where the largest opportunity sits in Colorado.

What you learn: insulation type, depth, and measured R-value against what is recommended for our climate zone, plus whether your attic's intake and exhaust venting are in balance. The two are related. An attic needs to breathe, and insulating without accounting for airflow can trap moisture.

Mechanical systems

Heating, cooling, and water heating equipment are documented by make, model, and manufacture date, and assessed against typical service life.

What you learn: where each system stands, and whether replacing it now is worth it. Equipment performance also depends on the envelope around it. A system that seems undersized is sometimes a correctly sized system fighting a leaky house.

Health and safety testing

This part gets less attention than it deserves. A full combustion appliance zone test checks whether your furnace, water heater, and other gas appliances are venting properly instead of spilling exhaust back into the house. Ambient carbon monoxide is monitored throughout, and accessible gas lines are checked for leaks.

The report also flags conditions worth knowing about in Colorado homes, including radon exposure and the possibility of lead paint in older houses.

Safety testing matters more, not less, once you start tightening a house. Air sealing and insulation change how a home breathes, which is why this testing should be repeated after that kind of work.

Schedule a Home Energy Audit

What Can a Home Energy Audit Find?

Findings vary by home. Not every audit turns up everything below, and some homes perform better than the owner expected.

• Air leaks in the envelope, and where they are

• Insulation that is thin, uneven, or missing

• The mechanism behind uneven temperatures between rooms or floors

• Identifiable sources of drafts

• Attic ventilation concerns

• Equipment nearing the end of its service life

• Health and safety issues unrelated to comfort

• Confirmation that something you were worried about is actually fine

Older homes tend to produce more findings, which matters given how much of Denver, Colorado Springs, and Fort Collins was built before current envelope standards.

What Happens After the Audit?

The testing produces data. The report is what makes it useful.

You receive a full written report, typically around forty pages, built from your home's measurements and modeled by our Professional Engineer. It opens with a plain-language summary of what you told us you were concerned about, what we found, and what we recommend, then works through the detail.

That detail includes your home's modeled annual energy use, weather-normalized against thirty-year climate data and compared with similar homes, so you can see how your heating, cooling, and baseline loads actually break down. Each potential upgrade gets its own section with findings, photographs, and a clear recommendation. There is a health and safety section, a rebate and incentive summary, and a glossary for the terminology.

What makes it useful is not the length. It is that every recommendation is labeled. Some items are marked as needing attention. Others are explicitly marked as needing no change at all.

That second category is the part homeowners tend not to expect. A report might tell you your windows are fine and the money would go further in the attic, or that your furnace has years left and replacing it now would not pay for itself. Knowing what to leave alone is as valuable as knowing what to fix, and it is what separates an assessment from a sales call.

How an Energy Audit Fits With Utility Rebates

A professional energy audit is the required first step to qualify for the maximum rebates available through Xcel Energy's Whole Home Efficiency program. That program rewards completing several qualifying improvements within two years of enrolling, so the order and timing of your projects affects the outcome.

To be precise: not every Xcel Energy rebate requires an audit, and not every home or improvement will qualify. Eligibility depends on the program, the equipment, your utility service, and your household. Some rebates have thresholds a particular home simply will not meet.

What an audit gives you is a plan, so you can sequence improvements deliberately instead of finding out afterward that a different order would have worked better.

Colorado Home Services is an Xcel Energy Trade Partner. For eligible rebates we handle the paperwork and apply the credit as an upfront discount on your invoice, so you are not waiting on a reimbursement check.

Not an Xcel customer? We can still help. We work with other utilities around the state and can walk you through how rebates work in your area. Reach out and we will tell you what is available where you live.

What Does an Energy Audit Cost?

The audit is a paid service, and we confirm the exact figure with you before scheduling. What is worth knowing up front is that eligible Xcel Energy homeowners receive a rebate of up to $200 toward it, depending on the type of audit performed, which covers a substantial share of the cost.

Xcel also offers a rebate toward a re-audit every two years. If you had one done a while ago and have made changes since, an updated picture is available without paying full price again.

One note on membership: Home Advantage discounts do not apply to the audit itself, because the invoice has to show the full amount for the Xcel rebate to apply. Membership discounts do apply to the improvement work that follows, which is where the larger dollars are anyway.

Schedule a Home Energy Audit

Do I Have to Make the Recommended Improvements?

No. The audit is a standalone service, and the report is yours to use however you like.

Some homeowners spread improvements over several years. Some handle parts themselves. Some take the report to another contractor or keep it as a record of the home's condition. An assessment that only had value if it led to a sale would not be much of an assessment.

Is a Home Energy Audit Worth It?

It is most useful when:

• A comfort problem has persisted through previous attempts to fix it

• Energy use seems high for the size of the home

• The home is older, or you do not know what has been done to it

• You are unsure whether your attic insulation is adequate

• You are planning several improvements and want to sequence them

• You just bought the house and want a baseline

  
  

It makes less sense if you already know what you need. If your attic has three inches of insulation and you have decided to upgrade it, you may not need a full assessment first.

The value is not in the testing. It is in not spending money on the wrong improvement.

Frequently Asked Questions

How long does a home energy audit take?

Most audits take two to three hours. The assessment covers the home room by room and includes diagnostic testing that has to be set up and run, so it takes considerably longer than a walkthrough. Larger or more complex homes can take longer.

What is a blower door test?

A calibrated fan mounted in an exterior doorway slightly depressurizes the house, pulling outside air in through leaks in the envelope. It measures total air leakage and makes individual leaks findable.

What is the difference between an energy audit and a home inspection?

A home inspection evaluates the condition of a home, usually for a real estate transaction, and covers everything from the roof to the foundation. An energy audit evaluates how the home performs, focusing on energy loss, air leakage, insulation, ventilation, and safety. It uses diagnostic equipment a home inspection does not, and it is not tied to a sale.

Do I need an energy audit to get Xcel Energy rebates?

Not for every rebate. An audit is the required first step for the maximum rebates available through Xcel Energy's Whole Home Efficiency program, but other rebates have their own requirements. Eligibility varies by program, equipment, and household.

Am I required to do the work you recommend?

No. The audit is a standalone service and the report is yours. There is no obligation to complete any recommended improvements with Colorado Home Services.

Do I have to be an Xcel Energy customer to get an energy audit?

No. We work with other utilities around the state, and the audit itself is the same regardless of who provides your power. What changes is which rebates apply. Reach out and we will tell you what is available in your area.

Start by Understanding Your Home

Most efficiency decisions get made backward: notice a problem, pick the fix that sounds most likely, find out afterward whether it worked. Understanding the home first turns a guess into a plan.

We serve Denver, Colorado Springs, Fort Collins, and communities across the Front Range.

Ready to find out how your home is performing?

Schedule a Home Energy Audit

Have a question first? Contact Colorado Home Services and we'll help you figure out the right next step.

Rebate programs, tax incentives, eligibility requirements and equipment qualifications are subject to change. Confirm current program requirements and available incentives before making a purchasing decision.

Related Colorado Home Services Resources

Wondering what an audit could lead to? Learn more about Colorado Home Services' energy efficiency services, including home energy audits, insulation and air sealing for Colorado homes.

Already know insulation is the issue? Learn more about attic and home insulation services and air sealing services.

Curious what you might qualify for? See our overview of Colorado and federal home energy rebates.

Related Reading: An audit often flags water heating as an opportunity. If yours is aging, read Water Heater Service & Replacement in Colorado.