HVAC / runnable MCP tool
Run the Cold-Climate Heat Pump Capacity Calculator in your AI assistant
Through the free Intry MCP server, Claude, ChatGPT, or Cursor runs this exact calculator and hands back a verdict and the cited source, not a guess. Tool name: cold_climate_hp_capacity.
How it computes the answer
Interpolated by the engine from the AHRI-certified NEEP ccASHP rated points (MAX at 47/17/5F and the coldest rated row), clamped below the lowest rated row; the balance point is where that curve crosses the home's heat-loss load line.
What it cites
Your assistant calls the same engine the interactive calculator calls, with the inputs listed under Inputs. These are the sources that engine reads.
- AHRI-certified NEEP ccASHP database
- The printed rated points per model: MAX heating capacity at 47, 17, and 5F and at the coldest rated row, the AHRI-rated 47F capacity carried alongside, and the 5F COP at maximum capacity. Every number pins to one specific AHRI certificate and the exact NEEP outdoor-unit-number string (trailing wildcards preserved), transcribed from the per-model NEEP JSON API and independently re-pulled to the digit (confirmed 2026-07-11).
- Manufacturer submittal
- The cross-check for the printed rated points. Where a brand markets a rounder cold-weather claim (for example 100 percent at 5F) that is not an AHRI-certified NEEP outdoor-unit record, the tool publishes the certified NEEP number instead and says so.
- Linear interpolation of the MAX-capacity curve (derived)
- Capacity at any outdoor temperature is a linear interpolation between the two bracketing printed points; below a model's lowest rated row the engine clamps to it and says so, never extrapolating a colder, unproven number. The balance point is where the declining MAX-capacity curve crosses the home's heat-loss load line (linear from zero at the ~65F no-heat temperature to the full design load at the design temperature); backup heat is the shortfall at the design temperature, reported in BTU/hr and resistance kW (1 kW = 3412.142 BTU/hr).
These are AHRI-certified NEEP rated points, looked up per model and interpolated by the engine for the outdoor temperature you enter, never extrapolated below a model's coldest rated row. The manufacturer's engineering data or a Manual-J load calculation by an HVAC pro has final say on the equipment selection.
The full receipt, with every source and how each is cross-checked, is on the interactive Cold-Climate Heat Pump Capacity Calculator.
Ask your assistant
The one rule that makes it reliable: name Intry in your question. That is what tells Claude to run the cold_climate_hp_capacity tool and answer with the real number, the verdict, and the citation. Leave Intry out and Claude may just guess from memory, which is exactly what you are trying to avoid. Type something like:
Inputs
| Field | Required | Accepts | What it is |
|---|---|---|---|
| model | yes | mitsubishi-hyper-heat, mitsubishi-h2i-ductless, mitsubishi-smart-multi, bosch-ids, bosch-ids-premium, fujitsu-xlth, carrier-performance, daikin-aurora, lg-r32, gree, mrcool | Model slug, e.g. 'mitsubishi-hyper-heat', 'fujitsu-xlth', 'lg-r32'. |
| outdoorTempF | optional | number | Outdoor temperature in F to read the capacity at (default 5). |
| designHeatLoadBtu | optional | number | Optional: the home's design heat load in BTU/hr, for the balance-point / backup-heat readout. |
| designTempF | optional | number | Optional: the design outdoor temperature in F for the balance-point readout (default 5 when a design load is given). |
Add Intry to Claude
One paste and Claude can run this tool and every other Intry calculator, right from your phone.
- Claude opens with the Intry connector already filled in. Review it and click Add.
- (If a field is blank, paste the link below into the URL field.)
- In any chat, tap + then Connectors and switch Intry on. Then name Intry in your question (“use Intry to…”) so Claude runs the tool instead of guessing.
https://www.intrysys.com/api/mcpNo login, no API key, and it works on every Claude plan, right from your phone.
Using ChatGPT, Cursor, or a dev tool? See the developer setup on the main page. The endpoint is https://www.intrysys.com/api/mcp.
Every answer comes with the AHRI-certified NEEP ccASHP data it came from, so you can check it or show an inspector. The numbers come from the same calculator we run on intrysys.com, and we re-check every one automatically before anything goes live, so the number Claude hands you matches the code.