---
title: "Geothermal Heating Cooling New Construction | AVANORTH"
canonical_url: "https://avanorth.ca/blog/geothermal-heating-cooling-systems-new-construction"
last_updated: "2026-03-10T07:33:42.245Z"
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description: "Geothermal heat pump guide: ground loop types, efficiency comparison, cost analysis, sizing, and why new construction is the best time to install."
"og:description": "Geothermal heat pump guide: ground loop types, efficiency comparison, cost analysis, sizing, and why new construction is the best time to install."
"og:title": "Geothermal Heating Cooling New Construction"
"twitter:description": "Geothermal heat pump guide: ground loop types, efficiency comparison, cost analysis, sizing, and why new construction is the best time to install."
"twitter:title": "Geothermal Heating Cooling New Construction"
---
AVANORTH Home
**Green Building**·April 25, 2026· 3 min read
# **Geothermal Heating and Cooling Systems for New Construction**
Geothermal heat pumps use the earth's stable underground temperature to heat and cool buildings with 300-500% efficiency. Understanding ground loop types, system sizing, and cost-benefit makes geothermal a sound investment for new builds.
**AVANORTH Team**
AVANORTH Construction
Below the frost line, the earth maintains a remarkably stable temperature: 8-12 degrees Celsius year-round in southern Ontario. A geothermal heat pump exploits this constant temperature by circulating fluid through underground loops and using a heat exchanger to transfer heat. In winter, the system extracts heat from the ground (which is warmer than the outside air). In summer, it reverses, dumping building heat into the ground (which is cooler than the outside air). The result is the most energy-efficient heating and cooling system available for residential and commercial buildings.
---
## How It Works
### System Components
1. **Ground loop:** Closed-loop piping (HDPE) buried underground, filled with a water-antifreeze solution that circulates continuously
2. **Heat pump unit:** Indoor unit containing a compressor, heat exchangers, and controls. Transfers heat between the ground loop and the building's air or water distribution system.
3. **Distribution system:** Forced-air ductwork (most common), hydronic radiant floor, or fan coils that deliver heating and cooling to the building
4. **Desuperheater (optional):** Captures waste heat from the heat pump's compressor to preheat domestic hot water. Provides essentially free hot water during cooling season.
---
## Ground Loop Configurations
| Type | Description | Land Required | Cost | Best For |
| --- | --- | --- | --- | --- |
| Horizontal loop | Trenches 1.2-1.8 m deep, loops laid horizontally | Large (150-250 m of trench per ton) | Lowest | Rural new construction with available land |
| Vertical loop | Boreholes 60-120 m deep, loops inserted vertically | Small (boreholes 5-6 m apart) | Highest | Urban sites, limited land area |
| Pond/lake loop | Coils submerged in a body of water | Requires pond/lake nearby | Low | Properties adjacent to water body |
| Open loop | Groundwater pumped from a well, passed through heat exchanger, returned to a second well | Requires adequate groundwater | Medium | Areas with productive aquifer, water permit required |
> **Ontario Climate Advantage:** Ontario's ground temperature of 8-12 degrees C is nearly ideal for geothermal. In winter, extracting heat from 10 degrees C ground is far more efficient than extracting heat from minus 20 degrees C air (as an air-source heat pump must do). This is why geothermal heat pumps achieve COP (Coefficient of Performance) values of 3.5-5.0, while air-source heat pumps may drop to COP 1.5-2.5 in extreme cold.
---
## Efficiency Comparison
| Heating System | Efficiency | Annual Heating Cost (2,000 sq ft home, Ontario) |
| --- | --- | --- |
| Electric baseboard | 100% (COP 1.0) | $3,500-4,500 |
| Natural gas furnace (96% AFUE) | 96% | $1,800-2,400 |
| Air-source heat pump (cold climate) | COP 2.0-3.5 | $1,200-1,800 |
| Geothermal heat pump | COP 3.5-5.0 | $800-1,200 |
### Total Cost of Ownership
| Item | Geothermal | Gas Furnace + AC |
| --- | --- | --- |
| Equipment and installation | $25,000-40,000 | $8,000-15,000 |
| Federal/provincial incentives | Up to $5,000 (Greener Homes) | None |
| Annual operating cost | $1,000-1,500 | $2,500-3,500 |
| Equipment lifespan | 20-25 years (heat pump), 50+ years (ground loop) | 15-20 years (furnace), 12-15 years (AC) |
| Maintenance | Minimal (filter changes, annual inspection) | Annual furnace tune-up, AC service |
---
## Sizing and Design
- **Heat loss/gain calculation:** A Manual J calculation determines the building's heating and cooling loads. This must be accurate; an oversized system is wasteful, an undersized one is insufficient.
- **Ground loop sizing:** Depends on soil thermal conductivity (measured by a thermal conductivity test for larger systems), heating/cooling loads, and loop configuration. In Ontario clay soils, typical vertical bore lengths are 55-75 m per ton of capacity.
- **Supplementary heating:** In extreme cold, a small electric backup heater may supplement the heat pump during the coldest hours. This is more cost-effective than oversizing the geothermal system for the rare peak load.
> **AVANORTH Recommendation:** For new construction, geothermal is the most cost-effective time to install because the ground loop installation can be coordinated with site excavation and backfill. We design geothermal systems using certified geo-exchange designers and install ground loops during the foundation phase. The upfront premium pays for itself through decades of low operating costs, and the ground loop outlasts the building itself.
#geothermal #heat-pump #energy-efficiency
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