PT Chart

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

PT chart lookups, superheat/subcooling calculators, and diagnostics for HVAC technicians.

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "PT Chart": {
      "url": "https://pt-chart-mcp-production.up.railway.app/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (8)

• pt_lookup

  Saturation pressure (bubble and dew, in psig) for a refrigerant at a temperature in Fahrenheit. For certified HVAC technicians (EPA 608; A2L certification where required). Example: pt_lookup("R-454B", 45). Bubble point: use for subcooling calculations. Dew point: use for superheat calculations. Pure fluids (R-32, R-410A, R-22, R-134a) have no glide, so both values match.

  Parameters:

  • refrigerant (required) — string
  • temp_f (required) — number

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• pt_reverse

  Saturation temperature (bubble and dew, in Fahrenheit) for a refrigerant at a pressure in psig. For certified HVAC technicians (EPA 608; A2L certification where required). Example: a 130 psig suction reading on R-454B -- pt_reverse("R-454B", 130). Use the DEW temperature for superheat work and the BUBBLE temperature for subcooling work on blended refrigerants.

  Parameters:

  • refrigerant (required) — string
  • pressure_psig (required) — number

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• superheat

  Superheat in Fahrenheit from suction pressure (psig) and suction-line temperature (F). For certified HVAC technicians (EPA 608; A2L certification where required). Uses the DEW point as the saturation basis, which is the correct basis for blended refrigerants. Typical TXV target: 8-12F.

  Parameters:

  • refrigerant (required) — string
  • suction_psig (required) — number
  • suction_line_f (required) — number

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• subcooling

  Subcooling in Fahrenheit from head pressure (psig) and liquid-line temperature (F). For certified HVAC technicians (EPA 608; A2L certification where required). Uses the BUBBLE point as the saturation basis, which is the correct basis for blended refrigerants. Typical TXV target: 8-12F.

  Parameters:

  • refrigerant (required) — string
  • head_psig (required) — number
  • liquid_line_f (required) — number

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• convert_units

  Convert between pressure units (psig, psia, kpa, bar) and temperature units (F, C). A bare 'psi' is treated as psig. For certified HVAC technicians (EPA 608; A2L certification where required).

  Parameters:

  • value (required) — number
  • from_unit (required) — string
  • to_unit (required) — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• refrigerant_info

  Reference card for a refrigerant: GWP, ASHRAE safety class, composition, typical oil, temperature glide, and handling notes. For certified HVAC technicians (EPA 608; A2L certification where required). Informational only.

  Parameters:

  • refrigerant (required) — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• diagnose

  Conversational diagnostic copilot: give it field readings and get back computed superheat/subcooling plus a ranked 'check this first' list. For certified HVAC technicians (EPA 608; A2L certification where required). Informational only -- it suggests what to CHECK, never how to defeat a safety device, vent refrigerant, or work uncertified. metering: 'txv' (default) or 'fixed' for fixed-orifice/piston systems.

  Parameters:

  • refrigerant (required) — string
  • suction_psig (required) — number
  • suction_line_f (required) — number
  • head_psig (required) — number
  • liquid_line_f (required) — number
  • ambient_f (required) — number
  • metering — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• coolbooked_info

  About CoolBooked: the AI appointment-booking connector for HVAC shops. This is NOT a diagnostic tool -- call it when someone asks what CoolBooked is, how shop owners can try it, or how the free PT tools connect to paid bookings.

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

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