Sources we rely on
Every answer on this site lists its sources at the bottom of the page. This page collects them: each publisher cited in the answers, on the “Get help” pages, and in the Census tables behind the charts, with the number of pages that rely on it. The list is built from the pages themselves, so it changes when they do.
- U.S. Environmental Protection Agency Cited on 25 pages
Documents and pages
- Refrigerant Sales Restriction
- Purchasing and Repairing Home Air-Conditioners or Heat Pumps
- Section 608 Technician Certification Requirements
- Stationary Refrigeration: Prohibition on Venting Refrigerants
- Technology Transitions GWP Reference Table
- Frequent Questions on the Phasedown of Hydrofluorocarbons
- Final Rule 23 Fact Sheet, Significant New Alternatives Policy program (April 2021)
- Substitutes in Residential and Light Commercial Air Conditioning and Heat Pumps (SNAP)
- State and Territorial Pesticide Agencies (updated March 17, 2026)
- Certification Standards for Pesticide Applicators (updated March 6, 2026)
- Choosing a Pest Control Company (EPA 735-F-05-010)
- Termites: How to Identify and Control Them (updated October 21, 2025)
- Tips for Hiring a Rodent Control Professional (updated January 29, 2026)
- Permethrin, Resmethrin, d-Phenothrin (Sumithrin): Synthetic Pyrethroids for Mosquito Control (updated February 26, 2026)
- Minimum Risk Pesticide: Definition and Product Confirmation (updated April 8, 2026)
- Moisture Control Guidance for Building Design, Construction and Maintenance (2013)
- A Brief Guide to Mold, Moisture and Your Home
- Fix a Leak Week
- Know Your Flow and Curb Water Waste: A WaterSense Guide to Leak Detection and Flow Monitoring Devices (EPA 832-F-26-001, February 2026)
- Mold and Health
- What is the difference between mold and mildew?
- Who can test my home or clean, fix and remediate my home for mold?
- Mold Cleanup in Your Home
- Ten Things You Should Know About Mold
- Text Version of the Flooded Home
- How can I tell if my home contains lead-based paint?
- Lead Renovation, Repair and Painting Program
- Hazard Standards and Clearance Levels for Lead in Paint, Dust and Soil (TSCA Sections 402 and 403)
- Understanding EPA's Lead-Based Paint Dust Rule (fact sheet, October 2024)
- When are the compliance and effective dates for the dust-lead reconsideration rulemaking?
- 40 CFR 745.63, Definitions
- 40 CFR 745.65, Lead-based paint hazards
- Questions and Answers for Homeowners and Renters about Understanding Lead Inspections, Risk Assessments and Abatements
- Introduction to Pesticide Labels
- Citizen's Guide to Pest Control and Pesticide Safety
- Lead Renovation, Repair and Painting Program
Cited on:
- AC Not Working in a Heat Wave: How to Stay Safe Until Repair
- How to Compare HVAC Quotes and When to Get a Second Opinion
- Is R-410A Being Phased Out? What the 2026 EPA Rule Changed
- How to Check a Pest Control License in Any State
- How to Clean Up Mouse Droppings Safely (Hantavirus)
- Do Termites Come Back After Treatment?
- Does Homeowners Insurance Cover Termite Damage?
- Do Mosquito Yard Sprays Work? What the Research Shows
- Termite Infestation Probability Map: What Your Zone Means
- How to Get Rid of Ticks in Your Yard
- Water in the Basement After Rain: Causes and Fixes
- How to Tell If You Have a Hidden Water Leak
- Ice Dams: Why They Leak Into Ceilings and How to Stop Them
- Is Black Mold Dangerous? What the CDC and EPA Say
- Mold in the Attic: What Causes It and How to Fix It
- Water Damage Categories 1, 2 and 3 Explained
- After a Flood: What to Throw Away and What You Can Save
- Wood Rot vs. Mold: How to Tell Them Apart
- Condensation on the Inside of Windows: Causes and Fixes
- Replacing Windows in a Historic Home or Historic District
- Lead Paint on Old Windows: How to Know If It's a Hazard
- Pests: get help
- Water & Mold: get help
- Windows: get help
- Heating & Cooling: get help
- International Code Council Cited on 19 pages
Documents and pages
- 2024 International Residential Code, Chapter 14, Section M1401.3 Equipment and Appliance Sizing
- 2024 International Residential Code, Section R325.2 Bathrooms
- 2021 International Residential Code, Chapter 3: Building Planning (Section R308, Glazing)
- 2024 International Fuel Gas Code, Chapter 5 Chimneys and Vents
- 2021 International Residential Code, Chapter 1 Scope and Administration, Sections R105 Permits and R109 Inspections
- 2021 International Energy Conservation Code, Chapter 4 [RE], Section R403.1.2 Heat pump supplementary heat
- International Residential Code 2024, Section R305, Protection Against Subterranean Termites (Texas Windstorm Insurance Association 2024 adoption, via UpCodes)
- International Residential Code 2021, Section R318.4 and Figure R318.4 (Colorado adoption, via UpCodes)
- International Residential Code 2021, Section R317.1, Location Required (Colorado adoption, via UpCodes)
- 2024 International Residential Code, Chapter 4, Sections R401.3, R404.1.6, R405.1 and R406
- 2024 International Residential Code, Section R806 Roof Ventilation
- 2024 International Residential Code, Section R905.1.2 Ice Barriers
- 2024 International Residential Code, Section M1501.1 and Table M1505.5
- 2024 International Residential Code, Chapter 3: Building Planning (Sections R319 and R321)
- 2024 International Residential Code, Chapter 2: Definitions
- 2024 International Residential Code, Chapter 1: Scope and Administration (Section R105)
- 2024 International Existing Building Code, Chapter 5: Prescriptive Compliance Method (Section 505.2)
- 2024 International Existing Building Code, Chapter 4: Repairs (Section 402.1)
- 2024 International Wildland-Urban Interface Code, Chapter 5: Special Building Construction Regulations (Sections 503-506)
- 2024 International Existing Building Code, Chapter 7: Alterations—Level 1 (Section 702.4)
Cited on:
- AC Not Working in a Heat Wave: How to Stay Safe Until Repair
- What to Do When Your Carbon Monoxide Alarm Goes Off
- How to Compare HVAC Quotes and When to Get a Second Opinion
- 80% vs 95% AFUE Furnace: What the Efficiency Rating Means
- Do Heat Pumps Work in Cold Weather? What to Check Before Buying
- No Heat in Winter: How to Stay Safe Until the Furnace Is Fixed
- Do You Need a Permit to Replace a Furnace or Air Conditioner?
- What Size AC Do I Need? How a Load Calculation Answers It
- Termite Infestation Probability Map: What Your Zone Means
- Crawl Space Moisture: Vented vs. Sealed Crawl Spaces
- Water in the Basement After Rain: Causes and Fixes
- Ice Dams: Why They Leak Into Ceilings and How to Stop Them
- Mold in the Attic: What Causes It and How to Fix It
- Egress Window Requirements for Bedrooms and Basements
- Storm Windows vs. Replacement Windows: How to Decide
- When Building Codes Require Tempered Glass in Windows
- Wildfire-Resistant Windows: What the Codes Require
- Window Fall Prevention: Sill Heights, Stops and Guards
- Heating & Cooling: get help
- ENERGY STAR Cited on 14 pages
Documents and pages
- Single-Family New Homes National HVAC Design Report, Rev. 14
- HVAC Maintenance Checklist
- 10 Tips for Hiring a Heating and Cooling Contractor
- Version 5.0 Furnaces Final Specification
- Air-Source Heat Pumps Key Product Criteria
- Version 6.2 Central Air Conditioner and Heat Pump Specification (Rev. March 2025)
- Storm Windows
- High Performing Windows or Storm Windows
- Residential Windows, Doors and Skylights: Key Product Criteria
Cited on:
- AC Not Working in a Heat Wave: How to Stay Safe Until Repair
- What to Do When Your Carbon Monoxide Alarm Goes Off
- How to Compare HVAC Quotes and When to Get a Second Opinion
- 80% vs 95% AFUE Furnace: What the Efficiency Rating Means
- Do Heat Pumps Work in Cold Weather? What to Check Before Buying
- No Heat in Winter: How to Stay Safe Until the Furnace Is Fixed
- SEER2 Requirements by State: What a New AC Must Meet
- What Size AC Do I Need? How a Load Calculation Answers It
- Egress Window Requirements for Bedrooms and Basements
- Replacing Windows in a Historic Home or Historic District
- Storm Windows vs. Replacement Windows: How to Decide
- When Building Codes Require Tempered Glass in Windows
- Window Warranties Explained: Full, Limited and Lifetime
- Windows: get help
- Centers for Disease Control and Prevention Cited on 11 pages
Documents and pages
- Heat and People without Air Conditioning
- About Heat and Your Health
- Carbon Monoxide Poisoning Basics
- QuickStats: Deaths Resulting from Unintentional Carbon Monoxide Poisoning, by Month and Year, 2010–2015 (March 3, 2017)
- Don't Heat Your Home with a Gas Oven
- Avoiding Carbon Monoxide Poisoning
- Preventing Hypothermia
- How to Clean Up After Rodents (reviewed April 8, 2024)
- How to Trap Up (reviewed April 8, 2024)
- About Hantavirus (reviewed May 13, 2024)
- Hantavirus Prevention (reviewed May 13, 2024)
- Reported Cases of Hantavirus Disease (updated April 23, 2026)
- About Lymphocytic Choriomeningitis (reviewed January 30, 2025)
- Adulticides (reviewed June 25, 2026)
- Mosquito Control at Home (reviewed April 16, 2024)
- Misting Systems for Mosquitoes (updated May 14, 2024)
- West Nile Virus: Causes and How It Spreads (reviewed July 15, 2026)
- Preventing Tick Bites (reviewed August 28, 2024)
- Where Ticks Live (reviewed July 30, 2025)
- Tick Lifecycles (reviewed October 11, 2024)
- How Lyme Disease Spreads (reviewed September 24, 2024)
- Keesing et al., Effects of Tick-Control Interventions on Tick Abundance, Human Encounters with Ticks, and Incidence of Tickborne Diseases in Residential Neighborhoods, New York, USA (May 2022)
- Eisen, Efficacy of Unregulated Minimum Risk Products to Kill and Repel Ticks (January 2024)
- Conceptual Framework for Community-Based Prevention of Brown Dog Tick–Associated Rocky Mountain Spotted Fever (November 2024)
- Acute Illnesses and Injuries Related to Total Release Foggers, 10 States, 2007–2015 (February 2, 2018)
- Facts About Stachybotrys chartarum
- About Mold
- Guidelines for Cleaning Safely After a Disaster
- Safety Guidelines: Reentering Your Flooded Home
- About Childhood Lead Poisoning Prevention
Cited on:
- AC Not Working in a Heat Wave: How to Stay Safe Until Repair
- What to Do When Your Carbon Monoxide Alarm Goes Off
- No Heat in Winter: How to Stay Safe Until the Furnace Is Fixed
- How to Clean Up Mouse Droppings Safely (Hantavirus)
- Do Mosquito Yard Sprays Work? What the Research Shows
- How to Get Rid of Ticks in Your Yard
- Why Do Roaches Come Back After Spraying?
- Is Black Mold Dangerous? What the CDC and EPA Say
- Water Damage Categories 1, 2 and 3 Explained
- After a Flood: What to Throw Away and What You Can Save
- Lead Paint on Old Windows: How to Know If It's a Hazard
- U.S. Department of Energy Cited on 8 pages
Documents and pages
- Consumer Furnaces (rulemaking page)
- Purchasing Energy-Efficient Residential Furnaces
- Residential Cold Climate Heat Pump Challenge
- Residential Cold-Climate Heat Pump Technology Challenge Specification (October 2021)
- Home Energy Rebates Program Notice 26-2 (effective May 29, 2026)
- 2023 Energy Conservation Standards for Central Air Conditioners, guidance issued October 5, 2022
- Consumer Central Air Conditioners and Heat Pumps (rulemaking history)
- Regional Standards Enforcement
- Unvented, Conditioned Crawlspaces: Building America Top Innovation
- Guide to Durable Attics (DOE/EE-0339, October 2010)
Cited on:
- 80% vs 95% AFUE Furnace: What the Efficiency Rating Means
- Do Heat Pumps Work in Cold Weather? What to Check Before Buying
- Do You Need a Permit to Replace a Furnace or Air Conditioner?
- SEER2 Requirements by State: What a New AC Must Meet
- What Size AC Do I Need? How a Load Calculation Answers It
- Crawl Space Moisture: Vented vs. Sealed Crawl Spaces
- Ice Dams: Why They Leak Into Ceilings and How to Stop Them
- Mold in the Attic: What Causes It and How to Fix It
- Federal Trade Commission Cited on 7 pages
Documents and pages
- How To Avoid a Home Improvement Scam
- Home Repair Scams
- Businessperson's Guide to Federal Warranty Law
- 16 CFR 700.1, Products covered (interpretations of the Magnuson-Moss Warranty Act)
- 16 CFR 701.3, Written warranty terms
- 16 CFR 239.4, 'Lifetime' and similar representations (Guides for the Advertising of Warranties and Guarantees)
Cited on:
- National Park Service Cited on 7 pages
Documents and pages
- Preservation Brief 39: Holding the Line: Controlling Unwanted Moisture in Historic Buildings (1996)
- FAQs, National Register of Historic Places
- Frequently Asked Questions, Certified Local Governments
- Evaluating Historic Windows for Repair or Replacement
- 36 CFR 67.7, Standards for Rehabilitation
- Preservation Brief 9: The Repair of Historic Wooden Windows
- Eligibility Requirements, Historic Preservation Tax Incentives
Cited on:
- Water in the Basement After Rain: Causes and Fixes
- How to Tell If You Have a Hidden Water Leak
- Ice Dams: Why They Leak Into Ceilings and How to Stop Them
- Mold in the Attic: What Causes It and How to Fix It
- Wood Rot vs. Mold: How to Tell Them Apart
- Replacing Windows in a Historic Home or Historic District
- Storm Windows vs. Replacement Windows: How to Decide
- Building America Solution Center (U.S. Department of Energy) Cited on 6 pages
Documents and pages
- Cold Climate Heat Pump Sizing and Selection
- Air Conditioning
- Termite Infestation Probability Map, Adapted from the 2021 International Residential Code
- Termite-Resistant Foundations and Walls
- Vented to Unvented Crawl Space (checklist)
- Unvented, Insulated Crawlspaces
- Construct Roofs and Attics for Ice Dam Prevention
- High-Performance (ENERGY STAR) Windows
Cited on:
- Do Heat Pumps Work in Cold Weather? What to Check Before Buying
- What Size AC Do I Need? How a Load Calculation Answers It
- Termite Infestation Probability Map: What Your Zone Means
- Crawl Space Moisture: Vented vs. Sealed Crawl Spaces
- Ice Dams: Why They Leak Into Ceilings and How to Stop Them
- Condensation on the Inside of Windows: Causes and Fixes
- Electronic Code of Federal Regulations Cited on 6 pages
Documents and pages
- 10 CFR 430.32, Energy and water conservation standards and their compliance dates, paragraph (c)
- 16 CFR 305.22, Energy information disclosures for heating and cooling equipment (Federal Trade Commission Energy Labeling Rule)
- 40 CFR 171.101, Commercial applicator certification categories
- 44 CFR 59.1, Definitions (National Flood Insurance Program)
- 44 CFR 60.3, Flood plain management criteria for flood-prone areas
Cited on:
- How to Compare HVAC Quotes and When to Get a Second Opinion
- 80% vs 95% AFUE Furnace: What the Efficiency Rating Means
- Do Heat Pumps Work in Cold Weather? What to Check Before Buying
- SEER2 Requirements by State: What a New AC Must Meet
- How to Check a Pest Control License in Any State
- FEMA's 50% Rule: What Substantial Damage Means for You
- U.S. Department of Housing and Urban Development Cited on 6 pages
Documents and pages
- Form HUD-NPMA-99-A, Subterranean Termite Protection Builder's Guarantee
- Termite Treatment Exception Areas (last revised November 3, 2021)
- Guidelines for the Evaluation and Control of Lead-Based Paint Hazards in Housing (2012 edition), Chapter 4: Lead-Based Paint and Housing Renovation
- Manufactured Housing Homeowner Resources
- 24 CFR 3280.106, Exit facilities; egress windows and devices
- 24 CFR 3280.404, Standard for egress windows and devices for use in manufactured homes
- 24 CFR 3280.403, Requirements for windows, sliding glass doors, and skylights
- 24 CFR 3280.113, Glass and glazed openings
- 24 CFR 3280.5, Data plate
- 24 CFR 3282.8, Applicability
Cited on:
- Do Termites Come Back After Treatment?
- Does Homeowners Insurance Cover Termite Damage?
- Termite Infestation Probability Map: What Your Zone Means
- Lead Paint on Old Windows: How to Know If It's a Hazard
- Replacing Windows in a Manufactured or Mobile Home
- When Building Codes Require Tempered Glass in Windows
- U.S. Consumer Product Safety Commission Cited on 5 pages
Documents and pages
- Carbon Monoxide Fact Sheet
- CO Alarms
- Carbon Monoxide Questions and Answers
- CPSC Issues Winter Weather Safety Tips to Prevent Fires and Carbon Monoxide Poisoning (March 16, 2026)
- 16 CFR 1201.1, Scope, application and findings
- 16 CFR Part 1201, Safety Standard for Architectural Glazing Materials
- CPSC Urges Families to Protect Children During National Window Safety Week (April 7, 2026)
Cited on:
- Federal Emergency Management Agency Cited on 4 pages
Documents and pages
- Extreme Heat
- Answers to Questions About Substantially Improved/Substantially Damaged Buildings (FEMA 213, August 2018)
- Increased Cost of Compliance Coverage
- Fact Sheet: Substantial Damage, What Does It Mean? (FEMA-4466-DR, December 2019)
- Rumor: FEMA will tear my home down if damage is more than 50% of its value
- Reducing Wildfire Risk to Your Home (Maui Wildfires Mitigation Assessment Team, Recovery Advisory 2, April 2025)
Cited on:
- U.S. Fire Administration Cited on 4 pages
Documents and pages
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- USDA Forest Service, Forest Products Laboratory Cited on 4 pages
- Federal Register Cited on 3 pages
Documents and pages
- Phasedown of Hydrofluorocarbons: Reconsideration of Certain Regulatory Requirements Promulgated Under the Technology Transitions Provisions of the AIM Act (May 26, 2026; FR Doc. 2026-10387)
- Energy Conservation Program: Notification of Petition for Rulemaking (April 27, 2026)
Cited on:
- Institute of Inspection, Cleaning and Restoration Certification Cited on 3 pages
- National Institute for Occupational Safety and Health Cited on 3 pages
- University of Florida IFAS Extension Cited on 3 pages
- City of Philadelphia, Department of Licenses and Inspections Cited on 2 pages
- Internal Revenue Service Cited on 2 pages
- Journal of Medical Entomology Cited on 2 pages
Documents and pages
- Trout et al., Efficacy of Two Pyrethroid Insecticides Applied as Barrier Treatments for Managing Mosquito Populations in Suburban Residential Properties (2007)
- Hollingsworth et al., Efficacy and Spatial Extent of Yard-Scale Control of Aedes albopictus Using Barrier Sprays and Larval Habitat Management (2020)
- Eisen and Stafford, Barriers to Effective Tick Management and Tick-Bite Prevention in the United States (2021)
Cited on:
- Mississippi State University Extension Cited on 2 pages
Documents and pages
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- National Pesticide Information Center Cited on 2 pages
- New York State Department of Environmental Conservation Cited on 2 pages
- North Carolina Department of Agriculture and Consumer Services Cited on 2 pages
- North Carolina State University Cited on 2 pages
- North Dakota State University Extension Cited on 2 pages
- Texas Administrative Code Cited on 2 pages
- U.S. Census Bureau Cited on 2 pages
- U.S. Census Bureau and U.S. Department of Housing and Urban Development Cited on 2 pages
- University of California Statewide IPM Program Cited on 2 pages
- University of Georgia Cooperative Extension Cited on 2 pages
- University of Kentucky Department of Entomology Cited on 2 pages
- Washington State Legislature Cited on 2 pages
- Air-Conditioning, Heating, and Refrigeration Institute (AHRI) Cited on 1 page
Documents and pages
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- American Journal of Epidemiology (CDC-led study) Cited on 1 page
- ASHRAE Cited on 1 page
- ASTM International Cited on 1 page
- California Air Resources Board Cited on 1 page
Documents and pages
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- California Building Standards Commission Cited on 1 page
- California Department of Consumer Affairs Cited on 1 page
Documents and pages
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- City of Portland, Portland Water Bureau Cited on 1 page
- Clemson University, Department of Pesticide Regulation Cited on 1 page
- Cornell Cooperative Extension Cited on 1 page
- Environmental Health Perspectives Cited on 1 page
- Florida Administrative Code Cited on 1 page
- Grant County, Washington Cited on 1 page
- Illinois Department of Public Health Cited on 1 page
Documents and pages
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- Institute of Medicine (National Academies) Cited on 1 page
Documents and pages
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- Insurance Services Office Cited on 1 page
- Iowa State University Extension and Outreach, AnswerLine Cited on 1 page
Documents and pages
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- Lawrence Berkeley National Laboratory Cited on 1 page
Documents and pages
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- Louisiana Administrative Code Cited on 1 page
Documents and pages
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- Montana State University Extension Cited on 1 page
Documents and pages
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- National Association of Insurance Commissioners Cited on 1 page
- National Fenestration Rating Council Cited on 1 page
Documents and pages
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- National Fire Protection Association Cited on 1 page
Documents and pages
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- New Castle County, Delaware, Department of Land Use Cited on 1 page
Documents and pages
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- New York Department of State, Division of Building Standards and Codes Cited on 1 page
- North Carolina State Historic Preservation Office Cited on 1 page
Documents and pages
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- Northeastern IPM Center, StopPests in Housing (funded by HUD's Office of Lead Hazard Control and Healthy Homes) Cited on 1 page
- NYC Department of Health and Mental Hygiene Cited on 1 page
- Oregon Building Codes Division Cited on 1 page
Documents and pages
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- Pacific Northwest National Laboratory Cited on 1 page
- Purdue University Cited on 1 page
Documents and pages
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- Rutgers New Jersey Agricultural Experiment Station Cited on 1 page
Documents and pages
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- Supreme Court of the United States Cited on 1 page
- Texas A&M AgriLife Extension Cited on 1 page
- Texas A&M AgriLife Extension, Texas Imported Fire Ant Research and Management Project Cited on 1 page
Documents and pages
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- The Journal of Infectious Diseases (trial led by CDC) Cited on 1 page
- U.S. Army Corps of Engineers, Cold Regions Research and Engineering Laboratory Cited on 1 page
- U.S. Department of Agriculture, Animal and Plant Health Inspection Service Cited on 1 page
- U.S. Environmental Protection Agency, HUD, FEMA, NIH and CDC Cited on 1 page
- U.S. Food and Drug Administration Cited on 1 page
Documents and pages
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- University of Arizona Cooperative Extension Cited on 1 page
Documents and pages
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- University of Arkansas Cooperative Extension Service Cited on 1 page
Documents and pages
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- University of California Agriculture and Natural Resources, Fire Network Cited on 1 page
- University of Michigan Environment, Health & Safety Cited on 1 page
Documents and pages
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- University of Minnesota Agricultural Extension Service Cited on 1 page
Documents and pages
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- USDA Forest Service Cited on 1 page
Documents and pages
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