Disclaimer

General Disclaimer

The information, calculators, tools, guides, and content ("Content") on ACCalculator.com are provided for general informational and educational purposes only. While we strive for accuracy, we make NO GUARANTEES about the completeness, reliability, or suitability of the Content for any particular purpose.

No Professional Relationship

Not Professional Advice

Use of ACCalculator.com does NOT create a professional relationship between you and us. Our Content is NOT:

• Engineering advice: We are not licensed engineers and do not provide engineering services
• Contractor recommendations: We don't perform installations or endorse specific contractors
• Legal advice: We do not interpret building codes, permits, or regulations
• Financial advice: Cost estimates are approximate and not financial planning
• Safety certifications: We do not certify equipment or installations as safe

Consult Licensed Professionals

Before making HVAC decisions, you MUST consult:

• Licensed HVAC contractors for complete Manual J load calculations
• Mechanical engineers for commercial or complex residential systems
• Building inspectors to ensure code compliance
• Energy auditors for whole-home efficiency assessments
• Electricians for electrical capacity and wiring

Calculator Limitations

Simplified Methodology

Our calculators use simplified Manual J-inspired algorithms designed for typical residential homes. They have limitations:

• Not full Manual J: Professional Manual J calculations consider 100+ variables; ours consider 10-15 major ones
• Standard construction: Assumes typical wood-frame construction, fiberglass/cellulose insulation, standard windows
• Single-zone assumptions: Does not account for complex multi-zone systems or ductwork design
• Typical climates: May be less accurate for extreme climates (Death Valley, Alaska, high altitude)
• Typical occupancy: Assumes standard residential use, not commercial or unusual applications

Inputs Determine Accuracy

Calculator accuracy depends entirely on YOUR inputs. Garbage in = garbage out. You must:

• Measure room dimensions accurately
• Correctly assess insulation quality and R-values
• Understand window orientation and shading
• Accurately count occupants and heat-generating equipment

We cannot verify your inputs and accept no responsibility for errors in data you provide.

Does Not Account For

Our calculators do NOT account for many factors professionals consider:

• Duct design, length, and insulation levels
• Specific window U-values and SHGC ratings
• Thermal mass effects (concrete, brick, earth-bermed)
• Unusual architectural features (atriums, extensive glass, thermal chimneys)
• Adjacent unconditioned spaces (garages, attics)
• Air infiltration specifics (blower door test results)
• Ventilation requirements per building codes
• Equipment derating for altitude or extreme conditions
• Existing equipment condition and performance

No Warranty of Results

Estimates Only

Calculator results are ESTIMATES, not specifications. We do not warrant that:

• Results are accurate for your specific home
• Recommended equipment sizes will perform adequately
• You will achieve expected energy savings or comfort
• Results comply with local building codes
• Our estimates match professional Manual J calculations

Potential Errors

Our calculators may contain errors, including:

• Software bugs or calculation errors
• Outdated climate data or equipment specifications
• Typos in guides or content
• Incorrect algorithm assumptions

If you find errors, please report them, but we make no guarantee of correction.

Limitation of Liability

Use at Your Own Risk

YOU ASSUME ALL RISK for using ACCalculator.com. We are NOT LIABLE for:

Financial Losses

• Cost of incorrectly sized HVAC equipment
• Higher energy bills from oversized or undersized systems
• Wasted contractor visits or diagnostic fees
• Equipment replacement costs
• Lost home value from poor HVAC performance

Property Damage

• Water damage from frozen or burst pipes (undersized heating)
• Mold or humidity damage (poor dehumidification)
• Electrical damage from improper equipment sizing
• Structural damage from HVAC-related issues

Personal Injury

• Health effects from poor indoor air quality
• Heat stroke or hypothermia from inadequate conditioning
• Injuries during DIY installation attempts
• Carbon monoxide poisoning (always use licensed pros for gas equipment)

Consequential Damages

• Lost productivity or business income
• Temporary housing costs during repairs
• Medical expenses from HVAC-related health issues
• Any indirect, incidental, or consequential damages

Maximum Liability: $100

Our total aggregate liability to you, for any and all claims arising from use of ACCalculator.com, shall not exceed ONE HUNDRED DOLLARS ($100 USD), regardless of the cause of action.

Third-Party Content

External Links

We link to third-party websites (ASHRAE.org, energy.gov, manufacturer sites) for additional information. We do NOT:

• Control or verify third-party content
• Endorse products, services, or companies linked
• Accept responsibility for third-party accuracy or safety
• Guarantee third-party websites are secure or privacy-respecting

Follow external links at your own risk.

Equipment Manufacturers

Any mention of equipment brands, models, or specifications is for educational purposes only. We do NOT:

• Endorse specific brands or models
• Receive compensation from manufacturers (no affiliate links)
• Guarantee manufacturer data is accurate or current
• Warrant that mentioned equipment will meet your needs

Regional Variations

Building Codes

Building codes vary by jurisdiction. Our Content may not reflect:

• Your local building, electrical, or mechanical codes
• Permit requirements for HVAC installation
• Required efficiency minimums (varies by state/region)
• Ventilation standards (some states have stricter requirements)

Always check local codes before equipment purchase or installation.

Climate Data

We use generalized climate zone data. Your specific location may differ due to:

• Microclimates (coastal, urban heat islands, elevation)
• Extreme weather events not captured in historical averages
• Climate change affecting design temperatures

DIY Warnings

Installation Requires Professionals

DO NOT attempt HVAC installation without proper licensing and training. Risks include:

• Electrical hazards: HVAC systems use high voltage—risk of electrocution
• Refrigerant handling: Requires EPA certification—illegal to vent refrigerants
• Gas connections: Improper gas work causes carbon monoxide poisoning and explosions
• Structural damage: Improper mounting can cause equipment to fall
• Voided warranties: Most manufacturers void warranties for DIY installation
• Code violations: Unpermitted work creates liability and hurts home resale value

Use Calculators Responsibly

Our calculators are for:

• ✓ Initial research and education
• ✓ Verifying contractor quotes (as a second opinion)
• ✓ Understanding sizing factors and variables

They are NOT for:

• ✗ Final equipment selection without professional input
• ✗ DIY installation specifications
• ✗ Challenging licensed contractors unless you have data to support concerns

Medical and Safety Disclaimer

Proper HVAC sizing affects health and safety. We do NOT provide medical advice. If you have:

• Respiratory conditions (asthma, COPD)
• Allergies or immune system disorders
• Infants, elderly, or medically fragile occupants

Consult medical professionals AND HVAC specialists about humidity control, air filtration, and ventilation requirements.

Changes to Content

We may update Content at any time without notice. We are not obligated to:

• Maintain historical versions of calculators
• Notify users of changes or corrections
• Update previously published guides when standards change

Always use the most current version of our calculators.

No Guarantee of Availability

ACCalculator.com may be:

• Unavailable due to maintenance or technical issues
• Modified or discontinued at any time
• Restricted in certain regions

We are not liable for downtime, lost access, or discontinued features.

Assumption of Risk

By using ACCalculator.com, you acknowledge and accept that:

• HVAC sizing is complex and requires professional expertise
• Online calculators have inherent limitations
• You are responsible for verifying all information
• You assume all risks associated with HVAC equipment purchase and installation
• You will consult licensed professionals before making final decisions

Contact for Corrections

If you believe we have published incorrect or dangerous information, please notify us immediately:

• Email: support@accalculator.com
• Subject Line: "URGENT - Safety Issue" or "Content Correction Needed"

While we appreciate reports, we make no guarantee of investigation or correction.