Best Energy Efficient Heating and Cooling Systems for Homes
For homeowners seeking practical, energy-saving options to heat and cool living spaces, these mini-split systems offer efficient performance without requiring major renovations. The top picks below are ideal for different room sizes and installation scenarios, from compact bedrooms to larger living areas and home offices. This guide highlights the best for quiet operation, eco-friendly energy use, and easy DIY installation. Each option is evaluated for who benefits most and why it stands out in efficiency, control, and upfront practicality.
| Product | Best For | Key Benefit |
|---|---|---|
| Rellytech 12K BTU | Medium rooms up to 750 sq ft | Strong cooling/heating with ECO mode |
| EXNOS 12K BTU | Offices, sunrooms, garages | High SEER2, energy savings |
| MRCOOL Easy Pro 9K | Small spaces up to 400 sq ft | DIY installation, compact footprint |
| Rellytech 9K BTU | Smaller living areas up to 550 sq ft | Balanced performance and emissions |
| Rellytech 18K BTU | Whole-home zones up to 1,250 sq ft | Greater coverage, multi-room potential |
Rellytech 12,000 BTU Mini Split: Efficient All‑Season Comfort
The Rellytech 12,000 BTU system provides cooling and heating to spaces up to 750 sq ft. It offers a 19 SEER2 rating and energy-conscious ECO mode for optimized power use. Four fan speeds and a 90° swing enable tailored airflow for bedrooms, living rooms, or home offices. This unit is best for households seeking strong year-round comfort with a compact, pre-charged solution for mid-sized spaces.
Best for: medium rooms where rapid temperature adjustments and energy efficiency matter. Choose this if you want robust performance with flexible airflow and smart energy use. Caution: larger or open-plan spaces might need additional zoning for uniform comfort.
EXNOS 12K BTU Mini Split: Quiet, High-Efficiency Heating and Cooling
EXNOS delivers 12,000 BTU cooling and 12,500 BTU heating for rooms up to 750 sq ft. It emphasizes energy efficiency with SEER2 of 19 and HSPF2 of 8.5, plus ECO mode to curb power use. In sleep mode, noise drops to about 26dB, supporting restful nights in bedrooms or nurseries. Best for budget-conscious homes needing reliable all-season comfort without sacrificing quiet operation.
Best for: spaces where quiet operation and long-term energy savings are priorities. Caution: high-performance mode may consume more energy momentarily if the space is much larger than 750 sq ft.
MRCOOL Easy Pro 9K: DIY Mini Split For Small Rooms
This 9,000 BTU unit covers up to 400 sq ft, ideal for small bedrooms, offices, or compact living areas. It emphasizes easy DIY installation, reducing setup time and costs. Energy-efficient operation and quiet performance contribute to comfortable spaces without noticeable sound or high electricity use. Best for: users who want straightforward installation and reliable performance in smaller rooms. Caution: smaller capacity means it may struggle in very hot or very large rooms during peak season.
Rellytech 9K BTU: Compact, Efficient Ductless System
The 9,000 BTU Rellytech unit covers up to 550 sq ft with four operating modes and an ECO function for energy savings. It supports a 61°F–88°F range for comfortable year-round use in living rooms or home offices. Best for: smaller living spaces where a balance of performance and energy use is desired. Caution: performance may dip in very hot climates if not matched with proper insulation.
Rellytech 18K BTU: Whole‑Home Coverage Inverter
Designed for larger homes or zones up to 1,250 sq ft, the 18,000 BTU cooling and 18,400 BTU heating system offers broad coverage with four modes and ECO energy optimization. A 90° vertical swing and multiple fan speeds support flexible distribution across rooms. Best for: whole-home or multi-room setups where a single outdoor unit can serve several spaces. Caution: installation is more complex and may require professional assistance for optimal performance.
Buying Guide: What To Consider When Choosing Energy Efficient Mini Splits
- Room size and zoning: Match BTU ratings to the area needing climate control. For larger homes, consider multi-zone or higher-capacity units like the 18K BTU option.
- Energy efficiency metrics: Look for SEER (Seasonal Energy Efficiency Ratio) and HSPF (Heating Seasonal Performance Factor). Higher numbers indicate better efficiency.
- Noise levels: Sleep and nursery spaces benefit from low-noise operation. Check decibel ratings in sleep or low modes.
- Installation: DIY-friendly units save installation costs but ensure proper electrical capacity and refrigerant charging. Pre-charged designs simplify setup for single-room installs.
- Air distribution: Four fan speeds and adjustable swing help tailor comfort. Consider auto or quiet modes for bedrooms and study areas.
- Energy-saving features: ECO or auto mode can lower running costs by adjusting cooling or heating based on ambient conditions.
- Longevity and maintenance: Access to replacement parts and filters, and simple cleaning routines, extend system life and efficiency.
- Climate suitability: In very hot summers or cold winters, select units with strong heating performance and adequate insulation in the room.
FAQ
- What size mini split do I need for a 500 sq ft room?
Typically a 9,000 BTU to 12,000 BTU unit is suitable for a 500 sq ft space, depending on insulation and climate. Higher efficiency models reduce energy use.
- Are mini split systems noisy?
Modern inverter mini splits are designed for quiet operation, with many models offering sleep modes that reduce noise to around 26 dB.
- Can I install a mini split myself?
Some models advertise DIY installation. Ensure you follow all local codes and electrical requirements. If uncertain, professional installation is recommended for optimal performance and warranty considerations.
- What does SEER2 mean for energy costs?
SEER2 measures cooling efficiency over a season. Higher SEER2 values generally mean lower cooling costs, especially in hot climates.
- Is ECO mode worth using?
Yes, ECO mode helps balance comfort and energy use by adjusting settings to maintain a steady temperature with lower energy consumption.
- What should I consider for whole-home comfort?
Look for higher BTU capacity, multi-zone options, and the ability to daisy-chain multiple indoor units with a single outdoor unit to cover larger homes efficiently.