---
type: "Bill"
title: "Clarify use of certain refrigerants"
description: "Clarify use of certain refrigerants"
jurisdiction: "us/states/mt"
legislature: "Montana Legislature"
session: "2023"
identifier: "HB 433"
citation: "Montana HB 433 (2023)"
classification: ["bill"]
subjects: ["Buildings and Building Regulations", "Environmental Protection", "Federal Government"]
status: "enacted"
primary_sponsors: ["Tom Welch"]
version_count: 3
action_count: 46
vote_count: 6
first_action: "2022-12-09T14:38:31+00:00"
last_action: "2023-05-22T19:44:11+00:00"
source: "openstates"
source_identifier: "ocd-bill/2e1790ac-3c7f-421f-8363-6992929b2b94"
source_url: "https://bills.legmt.gov/#/bill/20231/LC3555"
source_hash: "456ce18e4b1edf9ead5b7c2defd51f510333ed3e3aac2771f14a9952ec784ea2"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-mt"]
---

# Montana HB 433 (2023) — Clarify use of certain refrigerants

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **HB0433.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=12556)
2. **HB0433_1.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=12554)
3. **HB0433_X.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=12555)

## Votes

- (H) Committee Executive Action--Bill Passed — **19–0** (pass) · lower
- (H) 3rd Reading Passed — **97–2** (pass) · lower
- (S) 2nd Reading Concurred — **49–1** (pass) · upper
- (S) 3rd Reading Concurred — **49–1** (pass) · upper
- (H) 2nd Reading Passed — **99–1** (pass) · lower
- (S) Committee Executive Action--Bill Concurred — **8–1** (pass) · upper

## Sponsors

- Tom Welch — primary (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2023-05-22T19:44:11+00:00** Chapter Number Assigned `became-law`
- **2023-05-18T22:49:24+00:00** (H) Signed by Governor `executive-signature`
- **2023-05-08T16:20:00+00:00** (H) Transmitted to Governor `executive-receipt`
- **2023-05-04T18:00:00+00:00** (S) Signed by President `passage`
- **2023-04-29T20:00:00+00:00** (H) Signed by Speaker `passage`
- **2023-04-23T19:04:39+00:00** (C) Printed - Enrolled Version Available `enrolled`
- **2023-04-23T19:04:38+00:00** (H) Returned from Enrolling
- **2023-04-20T15:17:38+00:00** (H) Sent to Enrolling
- **2023-04-19T02:30:00+00:00** (S) Returned to House
- **2023-04-18T22:03:00+00:00** (S) 3rd Reading Concurred `passage, reading-3`
- **2023-04-18T19:00:00+00:00** (S) Scheduled for 3rd Reading `reading-3`
- **2023-04-17T19:24:00+00:00** (S) 2nd Reading Concurred `reading-2, reading-2`
- **2023-04-17T16:00:00+00:00** (S) Scheduled for 2nd Reading `reading-2`
- **2023-04-13T19:36:00+00:00** (S) Committee Report--Bill Concurred
- **2023-04-12T21:00:00+00:00** (S) Committee Executive Action--Bill Concurred
- **2023-03-24T21:00:00+00:00** (S) Hearing
- **2023-03-13T20:09:07+00:00** (S) Referred to Committee `referral-committee`
- **2023-02-24T21:29:00+00:00** (S) First Reading `reading-1`
- **2023-02-24T18:23:00+00:00** (H) Transmitted to Senate
- **2023-02-23T22:12:00+00:00** (H) 3rd Reading Passed `passage, reading-3`
- **2023-02-23T20:00:00+00:00** (H) Scheduled for 3rd Reading `reading-3`
- **2023-02-22T21:02:00+00:00** (H) 2nd Reading Passed `reading-2, reading-2`
- **2023-02-22T20:00:00+00:00** (H) Scheduled for 2nd Reading `reading-2`
- **2023-02-16T20:22:00+00:00** (H) Committee Report--Bill Passed `committee-passage`
- **2023-02-16T15:30:00+00:00** (H) Committee Executive Action--Bill Passed `committee-passage`
- **2023-02-14T15:30:14+00:00** (H) Hearing
- **2023-02-08T20:09:28+00:00** (H) First Reading `reading-1`
- **2023-02-08T18:21:31+00:00** (H) Referred to Committee `referral-committee`
- **2023-02-07T16:34:49+00:00** (C) Introduced Bill Text Available Electronically
- **2023-02-07T01:40:43+00:00** (H) Introduced
- **2023-02-06T22:08:22+00:00** (C) Draft Delivered to Requester
- **2023-01-27T17:47:49+00:00** (C) Draft Ready for Delivery
- **2023-01-27T15:15:34+00:00** (C) Executive Director Final Review
- **2023-01-27T15:15:30+00:00** (C) Draft Ready for Delivery
- **2023-01-27T12:42:46+00:00** (C) Draft in Assembly
- **2023-01-26T23:52:00+00:00** (C) Executive Director Review
- **2023-01-24T23:26:25+00:00** (C) Bill Draft Text Available Electronically
- **2023-01-24T23:26:24+00:00** (C) Draft in Final Drafter Review
- **2023-01-24T20:31:53+00:00** (C) Draft in Input/Proofing
- **2023-01-22T21:07:02+00:00** (C) Draft to Drafter - Edit Review
- **2023-01-18T20:00:51+00:00** (C) Draft in Edit
- **2023-01-18T19:44:04+00:00** (C) Draft in Legal Review
- **2023-01-17T15:59:15+00:00** (C) Draft to Requester for Review
- **2022-12-27T19:22:08+00:00** (C) Draft Taken Off Hold
- **2022-12-13T20:53:00+00:00** (C) Draft On Hold
- **2022-12-09T14:38:31+00:00** (C) Draft Request Received `receipt`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/2e1790ac-3c7f-421f-8363-6992929b2b94`. Confidence: reported (aggregated from official Montana legislature records).