Home Energy Audit in Washington: Utility Programs & What They Find
Home Energy Audit in Washington: Utility Programs & What They Find
Complete guide to energy assessments and making your Washington home more efficient
What is a Home Energy Audit?
A home energy audit is a comprehensive assessment of how your home uses energy and where it wastes it. Professional auditors use specialized equipment to identify air leaks, insulation gaps, HVAC inefficiencies, and other energy-wasting issues.
In Washington, many utilities offer free or subsidized energy audits, making it an excellent first step before any efficiency upgrades. The audit provides a prioritized roadmap showing which improvements will save the most money for your investment.
Why Get an Energy Audit in Washington?
Washington-Specific Benefits
Climate considerations:
- Western WA: Mild winters but long heating season (8-9 months)
- Eastern WA: Cold winters AND hot summers (both heating and cooling)
- Moisture management: Air sealing prevents moisture problems
Utility programs:
- Many audits are free or heavily subsidized
- Rebates often require pre-audit
- Prioritized access to incentive programs
Average savings:
- Properly weatherized WA homes save 20-40% on heating
- Typical annual savings: $300-$800
Types of Energy Audits
DIY Walk-Through
Cost: Free
What you do:
- Visual inspection of obvious issues
- Check weatherstripping and caulking
- Review energy bills for patterns
- Identify drafty areas
Limitations:
- Can't quantify problems
- Misses hidden issues
- No access to incentive programs
Utility-Provided Assessment
Cost: Free to $50 (varies by utility)
What's included:
- Trained energy advisor
- Visual inspection
- Basic equipment testing
- Customized recommendations
- Information on rebates
Best for:
- Starting point before upgrades
- Access to utility programs
- Basic prioritization
Professional Comprehensive Audit
Cost: $300-$600
What's included:
- BPI-certified auditor
- Blower door test
- Infrared thermography
- Duct leakage testing
- Combustion safety testing
- Detailed written report
- Prioritized improvement list
Best for:
- Serious efficiency improvements
- Pre-purchase evaluation
- Complex homes
- Maximum savings potential
Washington Utility Programs
Seattle City Light
Home Energy Assessment:
- Cost: Free
- Duration: 1.5-2 hours
- Includes: Comprehensive walkthrough, recommendations
- Bonus: Free energy-saving items installed (LEDs, faucet aerators, etc.)
Rebates after assessment:
- Insulation: Up to $1.50/sq ft
- Air sealing: Rebates available
- Windows: Varies by type
- Heat pumps: Significant rebates
Puget Sound Energy (PSE)
HomeEnergy Assessment:
- Cost: Free for qualified customers
- Includes: Analysis, recommendations, rebate roadmap
Rebates available:
- Attic insulation: $0.40-$0.50/sq ft
- Floor insulation: $0.40/sq ft
- Duct sealing: Rebates available
- Smart thermostats: $50-$75
Snohomish PUD
Energy Efficiency Services:
- Free phone/email consultation
- In-home assessments for some programs
- Contact for current offerings
Avista (Eastern Washington)
Home Energy Audit:
- Cost: Free for customers
- Includes: Walkthrough, recommendations
- Rebates: Varies by improvement
Tacoma Power
Home Energy Review:
- Cost: Free
- Virtual or in-person options
- Focus on weatherization and heating
Clark Public Utilities
Energy Audit Program:
- Cost: Free
- Includes: Blower door test
- Rebate assistance
The Blower Door Test Explained
The blower door test is the cornerstone of a professional energy audit.
How It Works
- Setup: A calibrated fan is mounted in an exterior door
- Depressurization: Fan pulls air out, lowering indoor pressure
- Measurement: Equipment measures air flow required to maintain pressure difference
- Calculation: Results show how "leaky" your home is (ACH50 or CFM50)
What Results Mean
| ACH50 | Home Tightness | Typical Age |
|---|---|---|
| Below 3 | Very tight | New construction |
| 3-5 | Tight | Post-2000 |
| 5-7 | Average | 1980s-2000s |
| 7-10 | Leaky | 1960s-1980s |
| Above 10 | Very leaky | Pre-1960 or damaged |
Washington targets:
- New construction code: ~3 ACH50
- Reasonable retrofit target: 5-7 ACH50
- Diminishing returns below 3 ACH50
Combined with Infrared
During depressurization, auditors use infrared cameras to:
- See exactly where air is leaking
- Identify missing insulation
- Find thermal bridges
- Document problem areas
What Auditors Find (Common Issues)
Air Leakage Sources
| Location | Frequency | Impact |
|---|---|---|
| Attic penetrations | Very common | High |
| Rim joists/band boards | Very common | High |
| Windows/doors | Common | Moderate |
| Electrical outlets | Common | Low each, adds up |
| Plumbing/HVAC chases | Common | High |
| Crawl space penetrations | Common | Moderate |
| Recessed lights | Common | Moderate |
| Fireplace dampers | Common | High when open |
Insulation Issues
| Finding | Frequency | Solution |
|---|---|---|
| Insufficient attic insulation | Very common | Add blown insulation |
| Missing wall insulation | Common in older homes | Drill and fill |
| Compressed batts | Common | Replace or supplement |
| Gaps around penetrations | Very common | Air seal, then insulate |
| Settling insulation | Common | Top off |
HVAC Issues
| Finding | Frequency | Impact |
|---|---|---|
| Duct leakage | Very common | 20-30% energy waste |
| Poor filter maintenance | Common | Efficiency loss |
| Oversized equipment | Common | Short cycling, inefficiency |
| Old equipment (15+ years) | Common | 30-50% less efficient |
| Thermostat issues | Common | Easy fix |
Moisture/Ventilation
| Finding | Frequency | Impact |
|---|---|---|
| Inadequate bathroom exhaust | Very common | Moisture damage |
| No crawl space vapor barrier | Common | Moisture, mold |
| Blocked soffit vents | Common | Attic moisture |
| Dryer venting issues | Common | Moisture, fire risk |
What to Expect During an Audit
Before the Audit
Preparation:
- Gather 12 months of utility bills
- Note comfort complaints (cold rooms, drafts)
- Ensure access to attic, basement, crawl space
- Have HVAC maintenance records available
- Plan for 2-3 hours (comprehensive audit)
During the Audit (2-3 Hours)
Initial walkthrough (30 min):
- Discuss concerns and goals
- Visual inspection exterior/interior
- Note home age and construction type
Testing (1-1.5 hours):
- Blower door setup and test
- Infrared scanning during depressurization
- Duct leakage test (if accessible)
- Combustion appliance testing (safety)
Review (30 min):
- Preliminary findings discussion
- Questions and answers
- Next steps overview
After the Audit
What you receive:
- Written report (usually within 1-2 weeks)
- Infrared images of problem areas
- Prioritized improvement list
- Estimated costs and savings
- Applicable rebate information
Costs and ROI
Audit Costs
| Type | Cost | Best For |
|---|---|---|
| Utility assessment | Free-$50 | Starting point |
| Professional audit | $300-$600 | Comprehensive analysis |
| Real estate audit | $400-$700 | Pre-purchase |
Common Improvement ROI
| Improvement | Typical Cost | Annual Savings | Payback |
|---|---|---|---|
| Air sealing | $500-$1,500 | $100-$250 | 3-7 years |
| Attic insulation | $1,500-$2,500 | $150-$300 | 5-10 years |
| Duct sealing | $400-$1,000 | $100-$200 | 3-5 years |
| Smart thermostat | $150-$300 | $50-$150 | 2-4 years |
| Heat pump upgrade | $8,000-$15,000 | $500-$1,200 | 8-15 years |
Best ROI typically: Air sealing first, then insulation, then equipment.
DIY vs. Professional
DIY Assessment
What you can do:
- Utility bill analysis
- Visual inspection for obvious gaps
- Feel for drafts around windows/doors
- Check weatherstripping condition
- Review attic insulation depth
Limitations:
- Can't quantify leakage
- Miss hidden problems
- No access to rebate programs
When to Hire Professionals
Hire a professional audit when:
- Planning significant upgrades
- Comfort problems you can't solve
- Pre-purchase evaluation
- Accessing rebate programs requiring audit
- Complex home (multiple additions, unusual construction)
Questions to Ask Auditors
- Are you BPI (Building Performance Institute) certified?
- Will you perform a blower door test?
- Do you use infrared imaging?
- How long does the audit take?
- When will I receive the written report?
- Do you provide cost estimates for improvements?
- Are you connected to utility rebate programs?
- Do you also do the improvement work? (Note: some prefer auditors who don't, to avoid conflict of interest)
- What's included in your fee?
- Do you test combustion appliance safety?
After the Audit: Next Steps
Prioritize Improvements
Start with:
- Safety issues – Combustion, electrical, structural
- Air sealing – Best ROI, enables other improvements
- Insulation – After air sealing
- Duct sealing – Often overlooked, high impact
- Equipment upgrades – After envelope is addressed
Accessing Rebates
Process:
- Complete utility audit (often required first)
- Get multiple contractor quotes
- Apply for pre-approval (if required)
- Use qualifying contractors (if required)
- Submit completion documentation
- Receive rebate
Tip: Some rebates have limited funding—act quickly after audit.
Health and Safety Considerations
Combustion Safety
Audits should include combustion appliance testing:
- Carbon monoxide levels
- Draft/spillage testing
- Gas leak detection
Important: Tightening a house can affect combustion appliance performance. Professional audits address this.
Indoor Air Quality
Balance needed:
- Tight homes need controlled ventilation
- HRV/ERV may be recommended
- Avoid over-tightening older homes
- Bathroom and kitchen exhaust matters more in tight homes
Red Flags to Avoid
- "Free audit" that's actually a sales pitch for one product
- No blower door test offered
- No written report provided
- Recommending equipment replacement first (usually not best ROI)
- Pressure to sign contracts during audit
- Not BPI or otherwise certified
- Unwilling to explain findings
Find Energy Audit Professionals in Our Directory
All professionals are verified for:
✅ Active Washington L&I registration
✅ BPI or equivalent certification
✅ Current liability insurance
✅ Workers' compensation compliance
Browse Washington Energy Auditors →
Related Resources
Last updated: 2024. Utility programs change frequently—contact your utility for current offerings. Start with a free utility assessment when available.