Understanding the difference between split heating and central heating
Central heating: boiler, heat pump and distribution via the heating network
Central heating relies on a single generator. Boiler (gas, pellet) or air/water heat pump. It feeds a network of water radiators or underfloor heating. Heat is produced in one place, then distributed throughout the home. You control the whole system with a single set of controls, sometimes supplemented by thermostatic valves.
Split heating: electric radiators, stoves and room-by-room solutions
Split heating works with several independent units. Electric radiators, wood stove, insert, or reversible air/air air conditioner. Each zone is managed room by room. It's often simpler to install, but comfort and the bill depend heavily on insulation, usage and correct sizing.
Common cases in renovation: older homes, extensions and rarely used rooms
In renovation, you often come across mixed systems. An older home heated centrally, then an extension fitted with electric heating. Or rarely used bedrooms where occasional use is the goal. The idea is to keep an overall logic. Insulation first, then choice of generator(s), with suitable controls to avoid unnecessary heating. To go further on these choices, also see the challenges in renovation.
Profitability: the right criteria to decide based on your project
Investment cost, running cost and maintenance: what to actually compare
Don't just look at the quote. Compare the total cost over time. Investment minus grants deducted, actual consumption in kWh, maintenance contract, wear parts, and inspection costs. On a project, slightly more expensive equipment can still win out if the heating runs for a long time and maintenance is easy to organise.
Comfort, controls and performance: impact on the heating bill and usage
Profitability often follows comfort. Good controls, suitable emitters and a stable temperature avoid restarts and overheating. Aim for good controls rather than raw output. In practice, a well-managed system limits the gap between "on paper" and "at the customer's home", and therefore protects the bill.
Lifespan and reliability: anticipating replacement and breakdowns
Think in terms of lifecycle. Stated lifespan, warranties, parts availability, access to after-sales service, and risks linked to sizing. Also plan for replacing components (circulators, valves, boards) and downtime. Robust equipment, installed to the rules, costs less than repeated repairs.
Conversion: switching from split heating to central heating (or the reverse)
Converting to central heating: creating the network, emitters, output and balancing
Switching to central heating means installing a hydraulic network (flow and return), choosing emitters (radiators, underfloor heating) and recalculating the output room by room after the works. Settings shouldn't be improvised. Balancing and consistent controls avoid rooms that are too hot and returns that are too cold. That recalculation is worth documenting, with heat losses broken down room by room in an EN 12831-1 sizing report.
Converting to split heating: zoning, simplification and technical limits
Conversely, split heating makes zoning easier. You reduce the network and control zone by zone, often simpler in an occupied renovation. Limits to anticipate. Locations, noise, condensate drainage, and actual performance if the envelope isn't insulated.
Points of vigilance in 2026: electrical constraints, flue systems and compliance
In 2026, the switch also changes the constraints. Check the electrical supply (cross-section, protections, subscribed power) before installing a heat pump or convector heaters. On the boiler or stove side, the flue system must remain compliant (duct, air supply, exhaust). Finally, keep an eye on the RGE requirements and on the supporting documents for the grants.
Heating network: when it saves (or costs) money
Existing network to keep: renovation, sludge removal and settings to avoid extra costs
If your heating network is sound, keeping it avoids major works. Plan for a full sludge removal, flushing, checking the circulator and balancing the flow rates. Without these adjustments, the generator runs too hard, some rooms overheat and the bill climbs.
Network to create: routing, losses, pipe insulation and impact on the budget
Creating a network means length of pipe and installation time. Routes that are too long, unnecessary bends and runs through unheated areas increase losses and hours worked. Careful pipe insulation, especially outside the heated volume, limits lost watts and secures the budget.
Optimising the network: flow temperature, controls and compatibility with a heat pump
The right lever is lowering the flow temperature. Heating curve, zoning, thermostatic valves and room-by-room settings help stabilise comfort. Well-set controls make the network compatible with a heat pump and improve seasonal performance. To choose the right system, see choosing between an air/air heat pump and an air/water heat pump. To decide, the required output and the equipment are matched to the chosen flow temperature and the existing emitters.
Grants and requirements in 2026: what changes the profitability of a heating system
MaPrimeRénov' and CEE: equipment covered and effects on your quote
In 2026, the profitability of a heating change often hinges on two levers. As a single measure, MaPrimeRénov' can fund a heat pump or a connection to a district heating network, depending on your profile and your home; biomass boilers left that route on 1st January 2026 with decree no. 2025-956 and only recover the payment on a whole-house retrofit. The CEE add to this via premiums linked to standardised fiches, sometimes paid as a discount on the invoice. The result: the "net" quote can drop significantly, but only if the equipment and installation meet the requirements. To limit rejections and reworked files, anticipate the mistakes to avoid on the MaPrimeRénov' side.
RGE certification and supporting documents: securing eligibility during a heating conversion
Without an RGE-certified company in the right domain, there are no grants. Before signing, check the certification, its validity period, and what it actually covers. On the paperwork side, a detailed invoice (references, performance, surfaces, commissioning) and the certificates required for MaPrimeRénov' and the CEE avoid unpleasant surprises during an inspection.
Energy audit and works scenarios: choosing the right strategy based on the energy class
A simple heating replacement doesn't solve everything if the home is classed E, F or G. The energy audit, mandatory in certain cases and often required for large-scale renovation, helps compare several pathways. The idea is to aim for a consistent scenario: insulation, ventilation, then a suitable heating system. That's where profitability stabilises over time.
