Aerostar MERV 13 (1-inch) vs Nordic Pure MERV 12 (1-inch)
Bottom line
In our scoring the Nordic Pure wins, 5.9/10 to 5.2/10, and it is also the cheaper filter to keep in the furnace at about $39 a year against the Aerostar's $55. The Aerostar captures finer particles as true MERV 13, but it scores 0.0/10 on airflow fit in our rubric because MERV 13 in a 1-inch panel restricts airflow, so we lean toward it only for systems that can clearly handle the extra resistance - and you pay more per year for that capture, not less. The Nordic Pure gives up a step of filtration as MERV 12 but, in our view, is the better everyday pick for an older or higher-static furnace where airflow headroom matters more than the last increment of capture. Both are honest about their true MERV; that part is a wash.
The Nordic Pure leads this one 5.9/10 to 5.2/10 in our scoring, and the reasons are practical rather than subtle. The Aerostar is true MERV 13 on the ANSI/ASHRAE 52.2 scale but runs about $55 a year across 4 changes; the Nordic Pure is true MERV 12 and runs about $39 a year. Both label their real MERV with no proprietary MPR or FPR number, which is the honest baseline we want to see. The other catch is depth: packing MERV 13 into a 1-inch panel restricts airflow more, and that is where the Aerostar loses the most points.
| MERV 13 | True MERV (ANSI/ASHRAE 52.2) | MERV 12 |
| 7.0 | Verified Filtration30% | 5.0 |
| 5.0 | Total Cost of Ownership25% | 8.0 |
| 8.0 | Rating Honesty20% | 8.0 |
| 0.0 | Airflow Fit15% | 4.0 |
| 2.0 | Practical Fit10% | 2.0 |
FAQ
- Is the Aerostar MERV 13 (1-inch) better than the Nordic Pure MERV 12 (1-inch)?
- In our scoring the Nordic Pure MERV 12 (1-inch) rates 5.9/10 and the Aerostar MERV 13 (1-inch) 5.2/10. In our scoring the Nordic Pure wins, 5.9/10 to 5.2/10, and it is also the cheaper filter to keep in the furnace at about $39 a year against the Aerostar's $55. The Aerostar captures finer particles as true MERV 13, but it scores 0.0/10 on airflow fit in our rubric because MERV 13 in a 1-inch panel restricts airflow, so we lean toward it only for systems that can clearly handle the extra resistance - and you pay more per year for that capture, not less. The Nordic Pure gives up a step of filtration as MERV 12 but, in our view, is the better everyday pick for an older or higher-static furnace where airflow headroom matters more than the last increment of capture. Both are honest about their true MERV; that part is a wash.
- Which one should I put in my furnace?
- The Nordic Pure MERV 12 for most people - it leads 5.9/10 to 5.2/10 in our scoring and costs about $16 a year less to run. A 1-inch MERV 13 filter restricts airflow more, which is why the Aerostar scores 0.0/10 on airflow fit. Choose the Aerostar's true MERV 13 only if your system can clearly handle the added resistance.
- Is the Aerostar's MERV 13 worth losing airflow?
- Only if your blower has the headroom. The Aerostar is genuinely true MERV 13 on the ANSI/ASHRAE 52.2 scale and captures finer particles than the MERV 12 Nordic Pure. But in our view, forcing MERV 13 through a 1-inch panel on a system not built for it can choke airflow, and that restriction is exactly why it earns 0.0/10 on airflow fit in our scoring.
- Are these filters honestly rated?
- Yes. Both print their true MERV on the ANSI/ASHRAE 52.2 scale with no proprietary MPR or FPR number layered on top, which is the honest baseline we look for. Neither carries an accredited third-party certification beyond that MERV rating, and neither is AHRI certified, so we score the verified MERV and nothing more.