HVAC Assessment Tool For Homeowners (Free Online Calculator)

Free Professional HVAC Sizing Calculator

Get accurate Manual J load calculations for your home in minutes. This professional-grade HVAC sizing calculator helps you determine the exact heating and cooling capacity your home needsā€”before you talk to contractors.

Most HVAC systems are incorrectly sized, costing homeowners thousands in wasted energy and premature equipment failure. Our calculator uses the same Manual J methodology professional engineers use, accounting for your home’s insulation, windows, climate zone, and 15+ other critical factors.

What You’ll Get:

  • Precise BTU requirements for heating and cooling
  • Recommended system size in tons
  • Cost estimates for your area (budget, mid-range, premium)
  • SEER efficiency comparison with ROI calculations
  • Seasonal energy cost projections
  • Contractor quote verification tool

Enter your home details below to get started. Takes about 5 minutes.

Professional HVAC Sizing Calculator – Kore Komfort Solutions

šŸ  Professional HVAC Sizing Calculator

Get accurate Manual J calculations, cost estimates, and equipment recommendations for your home

šŸ“Š Visual Results šŸ’° Cost Estimator šŸ“… Seasonal Analysis šŸ”„ Contractor Comparison ā„ļø Mini-Split Configurator šŸ’” ROI Calculator

šŸ“ Your Location

šŸ’” Why Location Matters

Climate zones determine your heating and cooling loads. Different regions have vastly different requirements based on heating degree days and cooling degree days throughout the year.

šŸ” Home Details

šŸ§± Building Envelope

ā˜€ļø Environmental Factors

āš™ļø Current System (Optional)

šŸŽÆ Your Complete HVAC Analysis

Professional-grade sizing with cost estimates and recommendations

šŸ“Š System Size Visualization

Undersized
Too Small Perfect Zone
Optimal Sizing Oversized
Too Large

Your calculated system falls in the Perfect Zone

Cooling Capacity
—
BTU/hr
Heating Capacity
—
BTU/hr
System Size
—
Tons

šŸ’° Installation Cost Estimate for Your Area

Budget System
—
Mid-Range System
—
Premium System
—

* Prices include complete installation with new ductwork/line sets, permits, and warranty. Actual costs vary based on accessibility, existing infrastructure, and chosen brand.

šŸ’” Energy Efficiency Comparison (ROI Calculator)

Compare efficiency ratings to see annual savings and payback period for higher-efficiency systems:

SEER 14
Base Price
–/year
Baseline
SEER 16
+$800
Save –/year
— year payback
SEER 18
+$1,500
Save –/year
— year payback
SEER 20+
+$2,500
Save –/year
— year payback

šŸ’” Recommended: SEER 16+ for most climates. Higher ratings pay for themselves through lower utility bills.

šŸ“… Estimated Annual Operating Costs

Estimated Annual Cost (SEER 16)
—

Based on — sq ft home in —
Electricity rate: Regional average

šŸ”„ Compare Contractor’s Quote

Got a quote from a contractor? Enter their recommended system size to see if it matches your calculated needs:

šŸ“§ Get Your Detailed PDF Report

Enter your email to receive a comprehensive PDF report including:

  • Complete Manual J calculation details
  • Equipment recommendations by brand
  • Monthly cost projections for your specific home
  • Contractor interview checklist
  • Rebates and incentives available in your area

What to Do With Your Results

Now that you know what size system your home needs:

  1. Read the complete guide – Best Ductless Mini-Split Systems: 2026 Buying Guide (Brand Comparison & Costs)
  2. Compare contractor quotes – Use your calculated size to verify contractor recommendations
  3. Explore system types – Learn about mini-split vs central air options
  4. Check available rebates – See tax credits and local incentives

Questions about your results? Email us at mike@korekomfortsolutions.com Call or text 740-716-5324.