This week, 4 Household Durables stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

Whirlpool Corporation’s (WHR) ratings are looking better this week, moving up to a B from last week’s C. Whirlpool Corporation manufactures and markets appliances and products for home use. The company also gets A’s in operating margin growth, earnings growth, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of WHR stock.

The rating of NACCO Industries, Inc. Class A (NC) moves up this week, rising from a B to a A. NACCO Industries, Inc. Class A manufactures and markets forklift trucks and related service parts, as well as mines and markets lignite coal for use as a fuel in power generation by electric utilities. The company also gets A’s in free cash flow. For more information, get Portfolio Grader’s complete analysis of NC stock.

iRobot Corporation (IRBT) gets a higher grade this week, advancing from a B last week to a A. IRobot Corporation engages in designing, developing, and marketing robots for the consumer, government, and industrial markets worldwide. The company also gets A’s in earnings surprise. For more information, get Portfolio Grader’s complete analysis of IRBT stock.

Gafisa S.A. Sponsored ADR (GFA) earns a B this week, jumping up from last week’s grade of C. Gafisa S.A. Sponsored ADR is engaged in the development of residential buildings, land subdivisions and affordable entry-level housing. For more information, get Portfolio Grader’s complete analysis of GFA stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.