Compare installers: contact details, locations and Tukes register entries in one place.
We list 6 companies in Lahti. Of those, 4 are in the Tukes register (checked 11 September 2026). The brands that come up most often are Defa, Mitsubishi Electric and Orima.
Below is each company’s own page, with its contact details and the area it serves, and its offices on the map.
6 results
Serves all of Finland
Akku-Ässä Oy is a specialized battery retailer with over 30 years of experience. The company specializes in batteries, solar power systems, and battery re-celling services. They provide sales and installation services for consumers and businesses, with branches in Mikkeli and Lahti, as well as an online store.
✅ Tukes-certified Lämpöjokeri Oy is a full-service heat pump provider with 20 years of experience in energy renovations. We offer air-to-water heat pumps, geothermal heat pumps, solar power systems, and electric car charging stations as a turnkey service for households, companies, and housing cooperatives.
In the Tukes register: operating right e3, valid until 12.3.2029. Checked 11.9.2026.
Loistox Oy is a company specializing in solar power and the energy sector, which designs, sells, and installs solar power systems, air-to-water heat pumps, and air-source heat pumps on a turnkey basis. The company serves the entire Finnish territory, providing solutions for private homes, businesses, and farms.
In the Tukes register: operating right A (sj). Checked 11.9.2026.
Serves all of Finland
Sähönen Oy is a Lahti-based electrical company specializing in solar power plants, electrical installations, EV charging solutions, and lighting. We serve households, companies, and housing associations throughout Finland with turnkey solutions. The company is a registered Reliable Partner (Luotettava Kumppani).
In the Tukes register: operating right A. Checked 11.9.2026.
Tukes-certified electrical company. Sipilän Sähkö Oy is an electrical contractor founded in 2014 and a member of the Elfin chain. Serving companies, housing associations, and households in the Päijät-Häme region. Our services include electrical installations, solar power systems, EV charging stations, and fault repairs.
In the Tukes register: operating right A. Checked 11.9.2026.
Serves all of Finland
Established in 1985, Lemkem is a provider of energy and lighting solutions for properties. It offers comprehensive solutions in geothermal heat, solar energy, lighting, and heat recovery. The company specializes in its own design and installation, serving housing companies, commercial properties, municipalities, and cities.
Enter your postal code and the service. Before you send anything you will see which companies your request goes to – at most three.
Published prices across Finland run €1,500–€4,500. €1,500–€4,500 installed — a vendor’s stated range (fiksukuluttaja.fi, 2026). Some sources price the labour on its own, which is a different product under the same word: €60–€150 converting one existing block heater post — a marketplace’s stated range (urakkamaailma.fi, 28 August 2026). Usually quoted separately: upgrading the electrical panel, an electrical network survey and load management.
Sources:fiksukuluttaja.fi, 2026; urakkamaailma.fi, 28 August 2026
Household tax credit: 35% of the labour share of a company invoice, up to €1,600 per person per year, with a €150 own share (Verohallinto, 10 February 2026). The government has proposed raising this to 40% and €2,100 for 2026–2027, retroactively from 1 January 2026 (HE 113/2026 vp, Eduskunta, 11 June 2026). Parliament has not passed the bill, and the tax administration still writes about it in the conditional (Verohallinto, 16 June 2026).
Sources:Verohallinto, 10 February 2026; Eduskunta, 11 June 2026; Verohallinto, 16 June 2026
We list 6 companies in Lahti, and 4 of them are in the Tukes register (checked 11 September 2026). The map above shows which of them work nearest to you; open a company’s own page for its contact details and service area.