Home Energy Audit: Save Money on Bills

A home energy audit reveals where your house is wasting energy and costing you money on monthly bills. Whether you hire a professional or tackle a DIY audit, this process typically identifies 20-30% in potential energy savings through improvements like sealing air leaks, adding insulation, or upgrading inefficient appliances.

Quick Take

What you’ll accomplish: A complete assessment of your home’s energy efficiency with a prioritized list of improvements and estimated savings.

Time investment: DIY audit takes 4-6 hours over a weekend. Professional audit takes 2-4 hours but requires scheduling 2-3 weeks ahead.

Cost: DIY costs $50-100 in tools. Professional audits range from $200-600 but many utilities offer rebates or free audits.

Before You Start

What You’ll Need

Gather these items before beginning your home energy audit:

12 months of energy bills to establish baseline usage patterns
Home details: square footage, age, heating/cooling system type, insulation details if known
Basic tools for DIY: flashlight, incense sticks or candle (for air leak detection), digital camera, notepad
Utility account information to check for available rebate programs

How Long This Process Takes

DIY route: Plan for one full weekend. Saturday for exterior inspection and major systems, Sunday for detailed interior work and documentation.

Professional route: The audit itself takes 2-4 hours, but scheduling typically requires 2-3 weeks advance notice. Results and recommendations usually arrive within one week.

The One Thing to Check First

Before scheduling anything, verify what your utility company offers. Many utilities provide free or heavily subsidized energy audits, sometimes with instant rebates on efficiency improvements. Call your utility’s customer service line and ask specifically about “home energy audit programs” and “weatherization rebates.”

When NOT to Do This

During extreme weather (below 20°F or above 90°F) when your heating/cooling system can’t maintain normal temperatures
If you’re selling within six months — energy improvements rarely pay back quickly enough to boost sale price
Right after major renovations — wait 3-4 months for energy usage patterns to stabilize
During open enrollment periods for energy suppliers if you’re in a deregulated market — focus on rate shopping first

Step-by-Step Process

Step 1: Choose Your Audit Type

DIY Audit works best if you’re comfortable with basic home inspection tasks and want to save money. You’ll catch 70-80% of major efficiency issues.

Professional Audit makes sense if your home is older than 30 years, you’ve never done home improvements, or you want financing options for major upgrades. Professionals use blower door tests and thermal imaging cameras to find problems you’d miss.

Decision point: If your monthly energy bills exceed $200, the professional audit typically pays for itself through more precise recommendations.

Step 2: Establish Your Energy Baseline

Review 12 months of energy bills to calculate:

Average monthly kWh usage (electricity)
Average monthly therms or CCF (natural gas)
Seasonal patterns — summer vs. winter usage spikes

What to expect: Most homes use 40-60% more energy in peak season (summer for hot climates, winter for cold climates). If your seasonal spike exceeds 75%, you likely have significant heating/cooling efficiency problems.

Pro tip: Create a simple spreadsheet with monthly usage and costs. This becomes your “before” measurement for tracking improvement savings.

Step 3: Inspect Major Energy Systems

Start with the biggest energy users in your home:

Heating/Cooling System:

Check air filter condition (replace if dirty)
Look for ductwork in basements/crawl spaces — note any disconnected joints or torn insulation
Inspect outdoor AC unit for debris, bent fins, or refrigerant leaks

Water Heater:

Note age, type (tank vs. tankless), and capacity
Check for rust, leaks, or inadequate insulation around pipes
Measure temperature setting (should be 120°F maximum)

What you’ll find: Systems older than 15 years typically operate at 60-70% of original efficiency. Budget for replacement if your furnace or AC is over 20 years old.

Step 4: Hunt for Air Leaks

Air leaks account for 25-40% of heating and cooling costs in most homes.

DIY method: Light an incense stick and slowly move it around windows, doors, electrical outlets, and baseboards. Smoke that wavers or gets pulled indicates air movement.

Check these common leak spots:

Window and door frames
Electrical outlets on exterior walls
Recessed lighting fixtures
Attic access doors
Fireplace dampers
Foundation joints

Professional method: Blower door test pressurizes your home and measures air leakage rate. Results show exactly how much conditioned air you’re losing.

What to document: Take photos and note leak locations. Small leaks add up — sealing them can reduce energy bills by 10-20%.

Step 5: Evaluate Insulation

Attic insulation has the biggest impact on energy costs. Climb into your attic (safely) and measure insulation depth.

Target depths by climate:

Hot climates: R-30 to R-38 (10-13 inches of fiberglass)
Mixed climates: R-38 to R-49 (13-16 inches)
Cold climates: R-49 to R-60 (16-20 inches)

Wall insulation: Remove an electrical outlet cover on an exterior wall and peer inside with a flashlight. You should see insulation filling the cavity.

Red flags: Uneven insulation, compressed insulation, or gaps around pipes and wires indicate problems that require professional attention.

Step 6: Assess Windows and Doors

Single-pane windows waste enormous amounts of energy. Even if replacement isn’t in your budget, document their condition for future planning.

Check for:

Cracked or missing caulk around frames
Damaged weatherstripping
Windows that don’t close tightly
Storm windows in poor condition

Quick test: Hold your hand near closed windows and doors on a windy day. Cold air movement indicates seal problems.

Step 7: Document Lighting and Appliances

Lighting audit: Count incandescent bulbs and note fixture types. LED conversion typically pays back within one year.

Major appliances: Note age and efficiency ratings on:

Refrigerator/freezer
Washer and dryer
Dishwasher
Any window AC units

Energy vampires: Identify electronics that draw power when “off” — cable boxes, gaming consoles, phone chargers. These phantom loads add 5-10% to electric bills.

After You’re Done

Verify Your Documentation

You should have:

Photos of problem areas with locations noted
List of recommended improvements with priority ranking
Baseline energy usage calculations
Contact information for any contractors you’ll need

Professional audit deliverables:

Written report with specific recommendations
Cost estimates for improvements
Projected energy savings in dollars and percentages
Available rebate and financing information

Immediate vs. Long-term Changes

Do these immediately (under $100):

Seal obvious air leaks with caulk or weatherstripping
Replace incandescent bulbs with LEDs
Clean or replace HVAC filters
Adjust water heater temperature to 120°F
Unplug energy vampires when not in use

Plan these for next 1-2 years ($500-5000):

Add attic insulation
Seal and insulate ductwork
Upgrade to programmable or smart thermostat
Replace aging appliances with Energy Star models

Major investments (over $5000):

HVAC system replacement
Window replacement
Solar panel installation

Track Your Savings

Set up measurement system: Compare energy bills 3-6 months after implementing changes. Account for seasonal variations by comparing to the same months from previous years.

Realistic expectations: DIY improvements typically reduce bills by 10-20%. Professional audits with major improvements can achieve 30-40% savings.

Common Problems and Fixes

Problem: Conflicting Contractor Estimates

What happened: Different contractors recommend different solutions with widely varying costs.

Fix: Get at least three estimates and ask each contractor to explain why their approach differs. Focus on contractors who reference your audit findings specifically rather than giving generic recommendations.

Escalation: Contact your state energy office for certified contractor referrals if estimates vary by more than 50%.

Problem: Utility Rebates Are Confusing or Denied

What happened: Rebate applications get rejected for technical reasons or program details are unclear.

Fix: Call your utility’s energy efficiency department directly. Many utilities have dedicated staff to help customers navigate rebate programs. Ask for pre-approval before starting work.

Escalation: If rebates are wrongly denied, file complaints with your state public utility commission. Document all communications.

Problem: Energy Bills Don’t Improve After Improvements

What happened: You made recommended changes but don’t see expected savings.

Fix: Verify improvements were installed correctly. Insulation that’s compressed or air sealing that’s incomplete won’t deliver promised results. Many contractors offer performance guarantees.

Professional help: Energy auditors can perform follow-up testing to verify improvement effectiveness.

Problem: Overwhelming List of Recommended Improvements

What happened: The audit identified $15,000+ in potential improvements and you don’t know where to start.

Fix: Focus on improvements with payback periods under three years first. Air sealing and insulation typically offer the fastest returns, followed by efficient appliances.

Financing: Many utilities and state programs offer low-interest loans for energy improvements. Some contractors offer financing with payments designed to be less than energy savings.

Pro Tips

Timing Your Audit for Maximum Savings

Schedule professional audits during utility companies’ off-peak seasons (spring and fall). You’ll get faster scheduling and contractors often offer better rates.

Bundle improvements with other home projects. If you’re already renovating a room, adding insulation or air sealing costs much less than doing it separately.

Hidden Savings Opportunities

Time-of-use electricity rates can cut bills by 20-30% if your usage patterns fit. Ask your utility about these programs during your audit.

Demand response programs pay you to reduce electricity use during peak times. Smart thermostats can automate this participation.

Solar potential assessment: Even if solar panels aren’t in your current budget, document your roof’s solar potential. Many auditors include this analysis free.

What Most Guides Don’t Mention

Humidity control affects comfort and costs. Proper humidity levels (30-50%) let you set thermostats 2-3 degrees higher in summer and lower in winter while maintaining comfort.

Ductwork location matters more than ductwork condition. Ducts in unconditioned spaces (crawlspaces, attics) waste 20-30% of heated/cooled air even when properly sealed.

Energy improvements can affect indoor air quality. Making your home more airtight requires attention to ventilation. Discuss this with contractors, especially in older homes.

Use Comparison Tools to Verify Value

Before hiring contractors, research typical costs for your improvements on sites like YouCompare.com. Understanding market rates helps you negotiate better deals and avoid overpriced services.

Compare multiple financing options if you’re considering loans for major improvements. Utility-sponsored programs often beat bank rates, but credit unions and online lenders may offer competitive alternatives.

FAQ

How often should I get a home energy audit?

Every 5-7 years or after major home improvements. Energy efficiency standards improve continuously, and your home’s systems age and lose efficiency over time.

Can I trust utility company energy audits to be objective?

Yes, generally. Utilities profit when you use less energy during peak demand periods, so they’re incentivized to help you reduce overall consumption. However, get independent quotes before committing to contractor referrals.

What’s the difference between an energy audit and an energy assessment?

Energy assessments are basic evaluations often done remotely using your energy bills and home details. Energy audits include on-site inspection with specialized equipment like blower door tests and thermal imaging cameras.

Do home energy audits affect home insurance or resale value?

Audits themselves don’t affect insurance, but improvements might qualify you for discounts. Energy efficiency improvements rarely increase resale value dollar-for-dollar, but they make homes more attractive to buyers and can reduce time on market.

Should I get an energy audit before or after switching energy suppliers?

Before switching if you’re in a deregulated energy market. Understanding your usage patterns helps you choose between fixed-rate and variable-rate plans. High usage makes fixed rates more valuable; low usage often benefits from variable rates.

Conclusion

A thorough home energy audit transforms abstract monthly bills into a concrete action plan for savings. Whether you choose the DIY route for immediate improvements or invest in professional analysis for comprehensive efficiency upgrades, the key is translating findings into prioritized improvements that fit your budget and timeline.

The most successful energy audits lead to 20-30% reductions in monthly energy bills through a combination of quick fixes and strategic improvements. Start with the lowest-cost, highest-impact changes like air sealing and LED lighting, then plan larger investments based on your home’s specific needs and available rebate programs.

YouCompare.com helps you research contractors, compare financing options, and verify that your energy efficiency investments deliver real value. Our independent analysis cuts through marketing claims to show you which improvements actually pay for themselves — and which ones to skip.