# HouseExhale (remote · houseexhale.com)

Explain bedroom CO2 readings, check certified HRV/ERV airflow, and find US installers and rebates.

- Trust score: 81/100 (high trust)
- Change this week: +5
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-04

## Components

- remote · `houseexhale.com`: 81/100 (this document), [markdown](https://verifymcp.io/servers/attachmentnerd-houseexhale/houseexhale.md), [page](https://verifymcp.io/servers/attachmentnerd-houseexhale/houseexhale)

## Channel facts

- Endpoint: `https://houseexhale.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-04.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 82/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 1052 tokens (~105/item across 10 items; 5 tools + 5 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 43/100
  - Stability observed for 13 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 5 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).
  - Supports UI / widget rendering.

## Install

### How do I install the HouseExhale MCP server?

HouseExhale is a hosted endpoint at https://houseexhale.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http attachmentnerd-houseexhale 'https://houseexhale.com/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "attachmentnerd-houseexhale": {
      "url": "https://houseexhale.com/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "attachmentnerd-houseexhale": {
      "type": "http",
      "url": "https://houseexhale.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.attachmentnerd-houseexhale]
url = "https://houseexhale.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "attachmentnerd-houseexhale": {
      "type": "remote",
      "url": "https://houseexhale.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add attachmentnerd-houseexhale --url 'https://houseexhale.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  attachmentnerd-houseexhale:
    url: "https://houseexhale.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "attachmentnerd-houseexhale": {
      "Transport": "http",
      "Url": "https://houseexhale.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add attachmentnerd-houseexhale -t streamable-http -u 'https://houseexhale.com/mcp'
```

### Other

```json
{
  "mcpServers": {
    "attachmentnerd-houseexhale": {
      "type": "http",
      "url": "https://houseexhale.com/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-04 (score 81, +2)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “find_installers” rewrote its description, which is the text the model reads
- [functional improvement] Schema quality: fail → pass
- [functional] Server version: 1.0.0 → 1.0.1
- [cosmetic] “check_ventilation_unit” reworded the description of “unitId”
- [cosmetic] “explain_co2_reading” reworded the description of “measured”

### 2026-11-02 (score 79, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-31 (score 78, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-29 (score 77, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-26 (score 76, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-24 (score 75, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-23 (score 74, 0)

- [security] The server rewrote its instructions, which are the text every model session reads
- [functional regression] Schema quality: 133 → 164
- [functional improvement] Stability: unverified → 0.03

### 2026-10-22 (score 74)

First indexed and scored.

## MCP tools (5)

### `explain_co2_reading` (~170 tokens)

Explain a CO₂ reading

Explains a bedroom CO₂ reading against the precautionary 800 ppm average-while-asleep goal: band, distance from the goal, whether the measurement is comparable, signs of a monitor reading low, and free fixes with trade-offs. The goal is not a health limit. Door-open nights appear only as one-night tests, not fixes.

Input parameters:

- `measured` (string, required): night_average: the recorded average while asleep. overnight_high: the highest recorded number overnight. spot: one reading at one moment. A morning spot reading is not a recorded overnight high or av…
- `ppm` (number, required): The reading in parts per million
- `room` (string): Where it was measured (default bedroom)
- `sleepers` (integer): People who slept in the room that night, if known

### `check_ventilation_unit` (~229 tokens)

Check a quoted HRV or ERV

Checks a quoted HRV or ERV against bedroom airflow needs using exact-model HVI-certified data. Returns a screening verdict, reasons, assumptions and questions for the installer. Ambiguous model names return candidates for clarification rather than a guessed model. Does not provide a permit-ready design or guarantee installation performance.

Input parameters:

- `bedrooms` (array, required): Every bedroom, with how many people sleep in each
- `floorAreaSqft` (number): Conditioned floor area in square feet, for the daytime code rate
- `model` (string): The brand and model exactly as the quote prints it, e.g. "Broan-NuTone B160E75RS"
- `quotedType` (string): Whether the quote calls it an HRV or an ERV, to catch a mismatch
- `state` (string): Two-letter US state, e.g. "CO"
- `unitId` (string): An id from a previous result’s candidates identifying the exact model confirmed by the person
- `zip` (string): Five-digit ZIP code (used for the state if state is missing)

### `units_to_ask_about` (~148 tokens)

HRV and ERV units to ask about

Lists up to three reviewed HRV/ERV families whose HVI-certified airflow covers what the household’s bedrooms need at night, with margin: units to ask installers about, never a single pick or a recommendation, and never paid placement. Also returns the night airflow target and how it was worked out.

Input parameters:

- `bedrooms` (array, required): Every bedroom, with how many people sleep in each
- `floorAreaSqft` (number): Conditioned floor area in square feet, for the daytime code rate
- `state` (string): Two-letter US state, e.g. "CO"
- `zip` (string): Five-digit ZIP code (used for the state if state is missing)

### `find_installers` (~153 tokens)

Find HRV/ERV installers

Lists HRV and ERV installer companies for a US ZIP code in HouseExhale’s neutral order, with its ordering rule and coverage limits. Returns member companies where the installer program is open, otherwise researched companies from public pages covering the Colorado Front Range and New England. Installer membership and listing are free. Optional paid installer tools do not affect inclusion or ordering. No paid placements. This public tool cannot contact companies.

Input parameters:

- `job` (array): Only if it applies: tight (just air sealed, insulated or newly built), no-ducts (no forced-air ducts), condo (condo or apartment), service (asking a past installer back)
- `zip` (string, required): The home’s five-digit ZIP code

### `find_rebates` (~112 tokens)

Rebates and tax credits

What HouseExhale’s research found for a state (by ZIP code or state): utility and state programs that pay toward an HRV or ERV by name, other ventilation rebates, air sealing and insulation help, the state’s federal home energy rebates, state tax credits, and the status of the federal tax credits. Each with its link and date. Never promises eligibility.

Input parameters:

- `state` (string): Two-letter US state, if no ZIP code
- `zip` (string): Five-digit ZIP code

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/attachmentnerd-houseexhale/houseexhale#diagnostics

## Score history

- 2026-11-04: 81
- 2026-11-03: 79
- 2026-11-02: 79
- 2026-11-01: 78
- 2026-10-31: 78
- 2026-10-30: 77
- 2026-10-29: 77
- 2026-10-28: 76
- 2026-10-27: 76
- 2026-10-26: 76
- 2026-10-25: 75
- 2026-10-24: 75
- 2026-10-23: 74
- 2026-10-22: 74

## Common questions

### What is the HouseExhale MCP server?

HouseExhale is an MCP server listed in the public MCP registry as io.github.attachmentnerd/houseexhale. Explain bedroom CO2 readings, check certified HRV/ERV airflow, and find US installers and rebates. This page covers its hosted endpoint (https://houseexhale.com/mcp).

### Is the HouseExhale MCP server safe to use?

HouseExhale scores 81 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the HouseExhale MCP server expose?

HouseExhale exposes 5 tools: explain_co2_reading, check_ventilation_unit, units_to_ask_about, find_installers, find_rebates. Their descriptions and schemas cost roughly 812 tokens of context every time the server is loaded.

### Does the HouseExhale MCP server require authentication?

No. We connected to HouseExhale without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the HouseExhale MCP server still maintained?

HouseExhale is still listed as active in the MCP registry. We last reached this channel on 4 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://houseexhale.com/mcp
- Website: https://houseexhale.com/ai
- Changelog RSS feed: https://verifymcp.io/servers/attachmentnerd-houseexhale/houseexhale.xml
- Changelog JSON feed: https://verifymcp.io/servers/attachmentnerd-houseexhale/houseexhale.json
- HTML version of this page: https://verifymcp.io/servers/attachmentnerd-houseexhale/houseexhale