The average hotel night produces 35 kg of CO₂. IMPT funds 1 ton of UN-verified carbon removal on every booking — same price as direct, paid from our commission.
CO₂ produced by one hotel night, on average.
UN-verified CO₂ removed by your booking.
Of the per-night footprint — removed, not avoided.
Booking NH Köln Altstadt through IMPT gets you a discounted rate — around 10% below the direct price on most listings — plus free cancellation and 1 ton of UN-verified CO₂ removal per booking. The discount is applied automatically at checkout. No code to copy.
NH Köln Altstadt is a 4-star hotel in Koeln, Germany, bookable through IMPT's carbon-neutral hotel programme. Every booking removes 1 ton of UN-verified CO₂ from the atmosphere — physically extracted under United Nations carbon frameworks, retired on-chain, and paid from IMPT's commission at no extra cost to the guest. On-site facilities include Free Wifi, Family rooms, Non smoking rooms, Fitness Center, Parking, Wifi.
That makes NH Köln Altstadt one of the genuinely eco-friendly, sustainable, and climate-positive stays available in Koeln. The carbon-removal model used here differs from conventional offsets in three ways: removal credits are physically pulled from the atmosphere rather than representing avoided emissions; every retirement is recorded on a public blockchain so the credit can't be resold or double-counted; and verification is handled under UN frameworks — the most rigorous standard available.
Travellers searching for an eco hotel, green hotel, sustainable accommodation, or net-zero stay in Koeln can book NH Köln Altstadt at the same rate as direct (often less), with free cancellation on most rooms and a discounted price applied automatically at checkout. The IMPT booking is rate-matched against Booking.com and Hotels.com — the green angle never costs you extra. Browse other carbon-neutral hotels in Koeln →
Holzmarkt 47, Koeln, Germany
IMPT funds UN-verified carbon removal — physically pulled from the atmosphere, not a credit that might be resold.
The carbon removal comes from IMPT's commission. You pay the same as Booking.com or Hotels.com — often less.
Every tonne is retired on-chain and listed publicly. UN-framework aligned. No double-counting.
Same rate as any other platform — often cheaper. Pick dates, hit Book Green, done in 60 seconds.
Funded from IMPT’s commission. Real projects. Real carbon pulled from the atmosphere — UN-verified.
Every tonne is retired on-chain — project, location, verification body, immutable. No double-counting.
Most hotel "carbon-neutral" programmes use cheap avoidance offsets — credits that have been over-counted, double-sold, or untraceable. IMPT only retires UN-verified removal credits, the most rigorous independent standard available, and records each retirement on-chain so the credit can never be resold.
Sustainability, booking & policies, and what's on site — answered. Filter by topic or search for a keyword.
Yes. Every booking of NH Köln Altstadt through IMPT funds 1 ton of UN-verified CO₂ removal — physically pulled from the atmosphere, retired on-chain, no double-counting. That's about 28× the per-night footprint, fully removed at no extra cost to the guest.
NH Köln Altstadt is bookable through IMPT's green hotel programme: every stay funds 1 ton of UN-verified carbon removal, the booking is rate-matched or cheaper than direct, and the property's residual emissions are offset against measured atmospheric removal — not avoidance offsets.
Sustainable hospitality has four pillars — energy, water, waste, community. NH Köln Altstadt is part of IMPT's green programme, and the residual carbon footprint of every stay is fully removed via UN-verified projects. Property-specific certifications (LEED, Green Key, EarthCheck) are listed on the page when available.
Every credit IMPT retires is independently audited under United Nations carbon frameworks — the most rigorous standard available. Each tonne removed by a booking at NH Köln Altstadt is publicly trackable on-chain at app.impt.io/projects. No double-counting, no avoidance credits.
Removed. Most travel programmes buy avoidance offsets — certificates representing emissions someone promised not to produce. IMPT funds physical removal credits under the UN framework. The CO₂ is actually pulled from the atmosphere, the credit is retired on-chain, and it can't be resold.
No. You pay the same rate as direct — often less. The 1 ton of CO₂ removal is funded from IMPT's commission, not added to your bill. Free cancellation is available on most rooms.
Each booking funds 1,000 kg (1 ton) of UN-verified CO₂ removal — the equivalent of about 45 trees grown for a year, 79 days of driving avoided, or one return flight London→New York fully neutralised.
Yes — booking NH Köln Altstadt through IMPT applies a discounted price (around 10% below the direct rate on most listings) and every booking funds 1 ton of UN-verified CO₂ removal at no extra cost. The discount is applied automatically at checkout.
Most rooms at NH Köln Altstadt include free cancellation. Refundable rates are clearly marked at checkout. Cancellation deadlines are shown per room before you confirm.
Guests rate NH Köln Altstadt 10.0/10 — exceptional. Based on verified reviews from guests who stayed at the property.
NH Köln Altstadt is in Holzmarkt 47, Koeln, Germany. Coordinates: 50.9308, 6.9625.
Standard check-in at NH Köln Altstadt is from 15:00 and check-out is by 11:00 local time. Early check-in and late check-out may be available on request.
NH Köln Altstadt has 204 Hotel. Room types are shown at booking with live availability.
Yes — NH Köln Altstadt offers WiFi for guests. Coverage usually extends to all rooms and public areas.
Yes — NH Köln Altstadt offers parking for guests. Where the property has electric-vehicle chargers or eco-parking incentives, that's noted at checkout.
Breakfast is offered at NH Köln Altstadt. Many of IMPT's green hotels source ingredients locally — check the room options at booking for whether breakfast is included with your rate.
Yes — NH Köln Altstadt welcomes pets. Pet policy and any associated fees are confirmed at booking.
Yes — NH Köln Altstadt has a fitness facility for guests. Access hours are shown on the property page.
Yes — NH Köln Altstadt has spa or wellness facilities. Treatments and booking details are confirmed on arrival.
Yes — NH Köln Altstadt offers family rooms and welcomes children. Child policies and extra-bed availability are shown at booking.
Yes — NH Köln Altstadt has accessibility features for guests with reduced mobility. Specific accessible-room availability is shown at booking.
Verified outbound sources for travellers. Last verified: 29 March 2026.
Same hotel. Same price. 1 ton of CO₂ physically removed per booking. UN-verified, on-chain retired.