---
type: "Bill"
title: "Residential Rental Apartments - Air-Conditioning Requirement"
description: "Residential Rental Apartments - Air-Conditioning Requirement"
jurisdiction: "us/states/md"
legislature: "Maryland General Assembly"
session: "2026"
identifier: "SB 12"
citation: "Maryland SB 12 (2026)"
classification: ["bill"]
subjects: []
status: "enacted"
primary_sponsors: ["West"]
version_count: 4
action_count: 21
vote_count: 3
first_action: "2025-10-20"
last_action: "2026-05-26"
source: "openstates"
source_identifier: "ocd-bill/0f2325f7-e5be-4534-8cce-ec7241dbaeb3"
source_url: "http://mgaleg.maryland.gov/mgawebsite/Legislation/Details/sb0012?ys=2026RS"
source_hash: "46630ddc4a9ef44fa5488d12b8a3804b1f97154e4029c82a0944130ddfa5e43c"
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-md"]
---

# Maryland SB 12 (2026) — Residential Rental Apartments - Air-Conditioning Requirement

## Version chain

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

1. **Chapter - Residential Rental Apartments - Air-Conditioning Requirement** (committee substitute) — [source](http://mgaleg.maryland.gov/2026RS/Chapters_noln/CH_664_sb0012e.pdf)
2. **Enrolled - Residential Rental Apartments - Air-Conditioning Requirement** (committee substitute) — [source](http://mgaleg.maryland.gov/2026RS/bills/sb/sb0012e.pdf)
3. **First - Residential Rental Apartments - Air-Conditioning Requirement** (committee substitute) — [source](http://mgaleg.maryland.gov/2026RS/bills/sb/sb0012f.pdf)
4. **Third - Residential Rental Apartments - Air-Conditioning Requirement** (committee substitute) — [source](http://mgaleg.maryland.gov/2026RS/bills/sb/sb0012t.pdf)

## Votes

- Bill is on Third Reading for Final Passage. — **35–11** (pass) · upper
- On Third Reading (Amend) — **101–34** (pass) · lower
- On Third Reading — **33–11** (pass) · upper

## Sponsors

- West — primary (person)

## Timeline

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

- **2025-10-20** Pre-filed `introduction`
- **2026-01-14** First Reading Judicial Proceedings `referral-committee`
- **2026-01-13** Hearing 1/20 at 1:00 p.m.
- **2026-03-18** Favorable with Amendments Report by Judicial Proceedings `committee-passage-favorable`
- **2026-03-18** Favorable with Amendments { `committee-passage-favorable`
- **2026-03-18** Second Reading Passed with Amendments
- **2026-03-19** Third Reading Passed `passage`
- **2026-03-20** Referred Economic Matters `referral-committee`
- **2026-03-24** Hearing 4/02 at 1:00 p.m.
- **2026-04-02** Hearing canceled
- **2026-04-02** Hearing 4/02 at 1:30 p.m.
- **2026-04-02** Hearing canceled
- **2026-04-02** Hearing 4/02 at 2:30 p.m.
- **2026-04-09** Favorable with Amendments Report by Economic Matters `committee-passage-favorable`
- **2026-04-09** Favorable with Amendments { `committee-passage-favorable`
- **2026-04-09** Second Reading Passed with Amendments
- **2026-04-13** Third Reading Passed `passage`
- **2026-04-13** Senate Concurs House Amendments
- **2026-04-13** Third Reading Passed `passage`
- **2026-04-13** Passed Enrolled
- **2026-05-26** Approved by the Governor - Chapter 664 `executive-signature`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/0f2325f7-e5be-4534-8cce-ec7241dbaeb3`. Confidence: reported (aggregated from official Maryland legislature records).