Comfort, dialed in. Building by building.
From a single rowhouse furnace to a nine-building commercial portfolio — Capitol Climate Systems keeps DC heated, cooled and breathing easy.
Three crews. One standard.
Whether it's a 90° July emergency or a 200-unit chiller retrofit, the work gets done right the first time.
Residential
Row-house specialists. Mini-splits, full system swaps, smart thermostats, ERVs and more.
Multifamily & commercial
Boilers, chillers, RTUs, central plant retrofits and unit-turn programs property managers love.
Service & maintenance
Same-day repairs, seasonal tune-ups and contract plans that keep buildings running quiet.
2,000+ DC homes and counting.
From Petworth rowhomes to Cleveland Park colonials, our techs know the quirks of DC housing stock — narrow utility closets, undersized returns, and all.
- Full system installs & change-outs
- Heat pump conversions
- Ductless mini-splits
- Smart thermostats & ERVs
- 24/7 no-heat / no-AC service
A portfolio you can walk past.
We install and maintain mechanical systems across nine commercial properties in DC — boilers, chillers, RTUs, VRF, and the corridor pressurization that keeps tenants happy.
See the portfolio
Factory-trained on the brands you trust
4.9 ★ across 200+ reviews.
"Called at 10pm with no heat — they had a tech at our door before 8am and a new furnace running by lunch. Honest pricing, no upsell."
"Switched our entire portfolio to Capitol Climate last year. Unit-turn HVAC checks are seamless and our tenant complaints dropped to zero."
"Installed two mini-splits in our finished basement. Crew was clean, quick, and walked me through the controls before they left."
"Tuned up an ancient AC, then helped us plan a heat pump conversion next spring. Felt like getting advice from a friend, not a sales pitch."
Skip the breakdown. Skip the bill.
Members get cheaper repairs, faster service, and systems that actually last as long as the warranty says.
Essential
For single-family homes that just need the basics handled.
- 1 seasonal tune-up
- Filter swap included
- 15% off repairs
- Priority scheduling
Comfort
Our most popular plan. Two visits a year and zero surprises.
- Spring + fall tune-ups
- Coil cleaning
- 20% off repairs
- Free diagnostic visits
- No overtime fees
Building
For multifamily and commercial portfolios. Built to your scope.
- Quarterly inspections
- Bulk repair pricing
- Annual system audit
- Dedicated account lead
- 24/7 priority dispatch
Questions, answered.
Do you offer 24/7 emergency service?+
Yes. We dispatch around the clock for no-heat and no-AC calls — members get priority routing and no overtime fees.
How long does a typical install take?+
A standard furnace + condenser swap is one day. Mini-splits and ductless systems usually wrap in a day or two depending on line-set runs. We give you a firm timeline before we start.
Do you offer financing?+
Yes — 0% APR for 12 months and longer-term plans through our financing partners. We can pre-qualify you in minutes.
What areas do you serve?+
All of Washington DC, plus close-in Maryland (Bethesda, Silver Spring, Hyattsville) and Northern Virginia (Arlington, Alexandria, Falls Church).
What brands do you install and service?+
We're factory-trained on Carrier, Trane, Mitsubishi, Daikin, Lennox, Rheem and Bryant — but we'll service whatever you've got.
Do you handle multifamily and commercial buildings?+
Absolutely. We service nine commercial properties across DC, from boilers and chillers to unit-turn HVAC. Ask about our portfolio maintenance contracts.
The boring stuff, done relentlessly well.
Licensed & insured
Fully credentialed in DC, MD, and VA. EPA, NATE, and OSHA-trained crews.
On-time, on-call
Two-hour arrival windows and 24/7 emergency dispatch for contracted clients.
Built to last
Manufacturer-trained on Carrier, Mitsubishi, Daikin and LG. Five-year workmanship warranty.
No heat? No AC? Talk to a real person now.
Free estimates on installs. Honest diagnostics on repairs. No pressure, ever.