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Head-to-head · HVAC Estimating Software

STACK vs OneEstimate

  • Updated Sep 2026
  • Both researched from official sources
  • 5 checks side by side
STACK #3 in HVAC Estimating Software 5.0/10 Free plan · 7-day trial Free plan✓ 0 of 6 features Visit STACK
Higher score OneEstimate #5 in HVAC Estimating Software 7.5/10 Free plan · paid from $19/mo Free plan✓ 4 of 6 features Visit OneEstimate

STACK leads on 0 checks, OneEstimate on 4, and 1 is even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreOneEstimate · 7.5/10
  • Free planboth
  • Most featuresOneEstimate · 4 of 6

OneEstimate scores higher on our rubric for hvac estimating software: 7.5 against 5.0 out of 10; our editors rank them #5 and #3.

OneEstimate offers hvac cost database; STACK doesn't publish it. OneEstimate offers labor-rate database; STACK doesn't publish it. OneEstimate offers hvac takeoff tools; STACK doesn't publish it. OneEstimate offers proposal builder; STACK doesn't publish it.

STACK is the better fit for teams needing broad takeoff and estimating workflows. OneEstimate is the better fit for small HVAC teams wanting low-cost takeoff and proposals.

  • STACK fits best

    Teams needing broad takeoff and estimating workflows

  • OneEstimate fits best

    Small HVAC teams wanting low-cost takeoff and proposals

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Side by side

Feature STACK 5.0/10 Visit ↗ OneEstimate 7.5/10 Visit ↗
At a glance
Editor score 5.0 7.5
Ranking #3 in HVAC Estimating Software #5 in HVAC Estimating Software
Best for Teams needing broad takeoff and estimating workflows Small HVAC teams wanting low-cost takeoff and proposals
Pricing model Free plan + paid Free plan + paid
Starting price Not published Not published
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Desktop, Mobile Cloud
Platforms Web, Windows, iOS, Android Web
Integrations 17 integrations 1 integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market
Features STACK 0/6 · OneEstimate 4/6
HVAC cost database Not published ✓ (best)
Labor-rate database Not published ✓ (best)
HVAC takeoff tools Not published ✓ (best)
Proposal builder Not published ✓ (best)
Job costing Not published Not published
QuickBooks sync Not published Not published
Specs
Mobile apps Not published Not published
Our review
Pros
  • Digital measurements, markups, overlays, and drawing comparisons
  • Labor, material, item, and assembly estimating worksheets
  • Web, desktop, mobile access with accounting and ERP integrations
  • HVAC assemblies cover equipment, ductwork, insulation, and refrigerant
  • On-screen takeoff measures duct runs and counts fixtures or equipment
  • Branded PDF proposals and Excel exports support client-ready estimates
Cons
  • Workflows are construction-wide rather than HVAC-specific
  • ERP connectors are available only as a Pro add-on
  • Free plan focuses on viewing, markup, and core takeoff tools
  • Free and START plans limit takeoff to one per project
  • The product is available through the web only
  • Business-level BIM support is limited to IFC import
Our verdict

STACK is a cloud-based construction preconstruction platform for specialty contractors, general contractors, suppliers, manufacturers, owners, and developers. Its Takeoff & Estimate product lets HVAC teams upload digital plans, mark up…

Read the review →

OneEstimate is browser-based estimating software tailored to HVAC contractors and small construction teams. Its assemblies cover equipment, ductwork, insulation, refrigerant, diffusers, and grilles, while plan takeoff converts measured…

Read the review →
  1. STACKHVAC Estimating Software 5.0Free plan · 7-day trial
  2. OneEstimateHVAC Estimating Software 7.5Free plan · paid from $19/mo

Strengths and trade-offs

  • STACK — where it wins

    • Digital measurements, markups, overlays, and drawing comparisons
    • Labor, material, item, and assembly estimating worksheets
    • Web, desktop, mobile access with accounting and ERP integrations

    Where it doesn't

    • Workflows are construction-wide rather than HVAC-specific
    • ERP connectors are available only as a Pro add-on
    • Free plan focuses on viewing, markup, and core takeoff tools

  • OneEstimate — where it wins

    • HVAC assemblies cover equipment, ductwork, insulation, and refrigerant
    • On-screen takeoff measures duct runs and counts fixtures or equipment
    • Branded PDF proposals and Excel exports support client-ready estimates

    Where it doesn't

    • Free and START plans limit takeoff to one per project
    • The product is available through the web only
    • Business-level BIM support is limited to IFC import
  • STACK5.0/10 · Free plan · 7-day trial

    Broad digital takeoff and estimating for HVAC teams that need construction-wide workflows.

    Visit STACKFull verdict →
  • OneEstimate7.5/10 · Free plan · paid from $19/mo

    HVAC-focused takeoff and proposals with a permanent free tier and web delivery.

    Visit OneEstimateFull verdict →

More comparisons

All HVAC estimating software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026