Straight answers
Geothermal HVAC in Pakistan — cost, sizing, and how it works
Every answer below leads with the conclusion. For a number specific to your house, get the 2-minute estimate.
How much does a geothermal HVAC system cost in Pakistan?
Most full-villa Kelvin systems land between Rs 5M and Rs 10M installed, depending on house size, indoor units, and whether a night battery is included — the 2-minute estimate on /start gives a figure for your exact house. That covers the ground-source heat pump plant, borehole loop, indoor units or ducting, and the rooftop solar canopy. After installation, a flat Rs 2,500/month covers lifetime service, parts and care. Payment is one-time, or 48-month installments for approved customers.
How does geothermal cooling work in Pakistan's climate?
It moves your home's heat into the ground, which stays near 24°C all year in the Punjab plains — far cooler than 45°C summer air. A ground-source heat pump circulates water through sealed pipes in 45–60 m deep boreholes; because the machine rejects heat into cool earth instead of scorching air, it does the same job as your ACs on roughly half the electricity or less.
Does geothermal still work when it is 45–48°C outside?
Yes — outside air temperature barely matters to a geothermal system, which is exactly why it exists. Conventional ACs collapse in extreme heat because they must push heat into hotter and hotter air. Kelvin's system pushes heat into the ground, which holds ~24°C whether the afternoon is 35°C or 48°C, so capacity and efficiency stay flat through the worst of June.
How deep are the boreholes, and how much space does drilling need?
Typically 45–60 metres deep, and the rig needs about one car-parking space of access for 2–4 days. We drill vertical closed loops, insert HDPE U-pipes, grout them, and restore the surface — a lawn corner or driveway strip is enough. The buried loop has no moving parts and lasts 50+ years.
Can the system really run on solar with near-zero electricity bills?
Daytime, yes: the mechanical-room solar canopy typically carries the system's full daytime draw, and an optional battery covers the night. Because geothermal cuts the power the house needs for cooling roughly in half to begin with, the solar array needed to feed it is small enough to fit above the plant itself. Grid electricity becomes backup rather than the default.
What size system does a 1-kanal house need?
One ground-source plant plus 6–10 indoor units (or a central ducted air handler) serves a typical 1-kanal (~500 m²) villa. Exact tonnage depends on glazing, insulation, floors and occupancy — the /start configurator sizes it from your answers, and a site survey confirms it before anything is ordered.
How much cheaper is it to run than normal inverter ACs?
At design conditions the system operates at COP ~5–6, versus ~3 for premium inverter ACs — meaning each unit of electricity moves nearly twice the heat. In practice villa owners replace a wall of ACs drawing 15–25 kW at peak with a plant whose peak fits a ~3 kVA generator per typical zone-load, before solar contribution is counted.
Does it heat in winter too?
Yes — the same machine reverses and pulls warmth from the ground, which stays ~24°C when January air is near 5°C. One system replaces both your ACs and your gas or electric heaters, which matters as gas pressure and pricing worsen each winter.
Will it work during load-shedding?
Yes. Peak electrical draw is a fraction of the AC bank it replaces, so a ~3 kVA generator can carry it; the solar canopy covers daytime, and the optional battery bridges nights. Load-shedding resilience is one of the main reasons Pakistani homeowners choose geothermal.
How long does installation take?
Drilling takes 2–4 days; a typical full installation — loop, plant room, indoor units or ducting, solar canopy — completes in 2–3 weeks depending on the house. Under-construction homes are fastest because ducting goes in with the civil work; retrofits are planned around your rooms.
What maintenance does it need?
A flat Rs 2,500/month lifetime plan covers all service, parts and care — there is nothing else to budget. The underground loop is sealed and passive; the mechanical plant is one machine in one room instead of ACs scattered across every wall, which is what makes lifetime coverage economical.
Is there import duty on geothermal heat pumps in Pakistan?
No — geothermal heat pumps enter at 0% customs duty under Serial 21 of the FBR Fifth Schedule (PCT code 8418.6100). Pakistan's tariff structure explicitly favours geothermal equipment, which is part of why a world-class system is now viable for homes here.
How long does the system last, and what about warranty?
The buried loop lasts 50+ years; the heat pump plant is built around industrial scroll/inverter compressors with a service life measured in decades, covered end-to-end by the Rs 2,500/month lifetime care plan. Because Kelvin installs and maintains the whole chain, there is no multi-vendor warranty gap.
Which cities does Kelvin serve?
Kelvin currently serves Gujrat, Lahore, Sialkot, Gujranwala — with surveys booked through the callback form. Taking pre-bookings now · first installations October 2026.
Ground conditions we design for, by region
Kelvin's standard design assumptions for vertical closed loops — confirmed per site by survey before drilling.
| Region | Typical ground | Stable temp at depth | Design borehole depth |
|---|---|---|---|
| Lahore / central Punjab plains | Alluvial clay, silt | ≈24°C | 45–60 m |
| Gujrat / Sialkot / Gujranwala | Alluvial clay, sandy seams | ≈24°C | 45–60 m |
| Islamabad / Potohar | Clay over sandstone, gravels | ≈22–23°C | 50–70 m |
| Karachi coastal belt | Sandy, saline groundwater | ≈26°C | 40–55 m |
Geothermal vs conventional inverter ACs
Same villa, two ways to fight a Pakistani summer.
| Inverter AC bank | Kelvin geothermal | |
|---|---|---|
| Heat rejection sink | 45–48°C summer air | ≈24°C earth, year-round |
| Efficiency (COP) at peak summer | ~2.2–3.0 and falling with heat | ~5–6, flat in any weather |
| Peak electrical draw (villa) | 15–25 kW across many ACs | Fits a ~3 kVA generator per zone-load |
| Winter heating | Separate gas/electric heaters | Same machine, reversed |
| Outdoor hardware | Compressor on every wall | One plant in one room |
| Lifespan of outdoor side | 8–12 years in dust and sun | Loop 50+ years underground |
Your house, your number
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