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HVAC Replacement Cost Calculator for HVAC Companies, Built by Chatting with Claude

This HVAC replacement cost calculator gives homeowners a live estimate from their home size, system type, and SEER rating. A real number on the page means more of them schedule the in-home consult. You build it by chatting with Claude, it keeps your tonnage and equipment pricing tables, and your first form is free.

Build yours free →Get the build prompt

The form your customers fill out

A live calculator, not a static quote request. Your customer enters their details and watches the number update on the spot, which is what turns a browser into a booked job.

What it calculates

Why it closes more deals

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A live number closes deals

Customers who see a real estimate the second they enter their details are far likelier to book than ones told to call for a quote. The number is the hook.

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Runs your most complex spreadsheet

Multi-tab workbooks, lookup tables, tiered rates, conditional line items, the lot. If the math runs in Excel, CalcForms runs it behind a clean form.

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Update it by chatting

Prices move. Ask Claude to change a rate, add an option, or insert a step and the live form updates in seconds. No developer, no redeploy.

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Backtest before you publish

Run your last 20 real jobs through it and tune the formula until the live estimate matches what you actually charge. Ship it once it lines up.

How this form was built

No template builder and no code. One message to Claude with the CalcForms connector switched on:

✦ Claude with the CalcForms connector
Build an HVAC replacement cost calculator. Inputs: home square footage, system type (AC only, furnace only, AC + furnace, heat pump), efficiency tier, and ductwork. Size tonnage at 1 ton per 600 sqft, price AC at $2,200/ton, furnace flat $3,800, heat pump at $3,400/ton. Multiply by a 1.0/1.25/1.55 SEER2 tier factor, add $2,500 for partial ductwork or $6,000 for full, and a flat $450 permit. Show the homeowner an estimated installed system price.
Done. I built HVAC Replacement Cost Calculator with your pricing and deployed it to forms.badabingapp.cc. The math runs server-side and every submission is saved with the inputs and email. Want to add a field or change a rate? Just tell me.

Build this exact form

CalcForms is a connector you add to Claude once. After that you build and edit forms just by chatting.

  1. Add CalcForms to Claude. Open the Add custom connector dialog, name it Calcforms, and paste https://forms.badabingapp.cc. One time, about 60 seconds.
  2. Paste the prompt below. Claude builds the form, wires in your math, and hands you a live URL.
  3. Share it, then tweak by chatting. Put it on your site or send the link. Change a rate or add a field later just by asking.
Copy this prompt into Claude

"Build an HVAC replacement cost calculator. Inputs: home square footage, system type (AC only, furnace only, AC + furnace, heat pump), efficiency tier, and ductwork. Size tonnage at 1 ton per 600 sqft, price AC at $2,200/ton, furnace flat $3,800, heat pump at $3,400/ton. Multiply by a 1.0/1.25/1.55 SEER2 tier factor, add $2,500 for partial ductwork or $6,000 for full, and a flat $450 permit. Show the homeowner an estimated installed system price."

Example run: 1,800 sqft home, AC + furnace, mid efficiency, reuse ductwork: about $12,400 estimated installed price.

New to connectors? A connector (an MCP server) is a secure link between Claude and an app. The CalcForms connector lets Claude build, deploy, and update real calculator forms for you, all from the chat window.

Formulas it supports

FAQ

How does it size the system?
It estimates tonnage from square footage using your rule of thumb, then prices the equipment by ton. You can refine the sizing logic by asking Claude.
Can I price multiple brands and SEER tiers?
Yes. Keep your equipment in a lookup table by tier and the calculator applies the right price and efficiency multiplier automatically.
Does it handle full system versus AC-only swaps?
It branches on system type, so an AC-only quote and a full AC-plus-furnace quote use different equipment lines from the same form.
Will this match my real install quotes?
Backtest it against your recent installs and tune the per-ton rates until the live estimate matches what your techs actually quote.

Build yours in the next 10 minutes.

Your first form is free. No credit card.

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